diff --git a/src/Meezi.API/Controllers/DemoSeedController.cs b/src/Meezi.API/Controllers/DemoSeedController.cs
new file mode 100644
index 0000000..5d16ef2
--- /dev/null
+++ b/src/Meezi.API/Controllers/DemoSeedController.cs
@@ -0,0 +1,33 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Meezi.API.Services;
+using Meezi.Core.Interfaces;
+using Meezi.Shared;
+
+namespace Meezi.API.Controllers;
+
+[Route("api/cafes/{cafeId}/demo")]
+[Authorize]
+public class DemoSeedController : CafeApiControllerBase
+{
+    private readonly IDemoSeedService _demoSeed;
+
+    public DemoSeedController(IDemoSeedService demoSeed)
+    {
+        _demoSeed = demoSeed;
+    }
+
+    /// <summary>Seeds demo menu, tables, and inventory for any café. Owner-only.</summary>
+    [HttpPost("seed")]
+    public async Task<IActionResult> Seed(
+        string cafeId,
+        ITenantContext tenant,
+        CancellationToken ct)
+    {
+        if (EnsureCafeAccess(cafeId, tenant) is { } denied) return denied;
+        if (EnsureOwner(tenant) is { } ownerDenied) return ownerDenied;
+
+        var result = await _demoSeed.SeedAsync(cafeId, ct);
+        return Ok(new ApiResponse<DemoSeedResult>(true, result));
+    }
+}
diff --git a/src/Meezi.API/Extensions/ServiceCollectionExtensions.cs b/src/Meezi.API/Extensions/ServiceCollectionExtensions.cs
index d67a30f..b40d8ea 100644
--- a/src/Meezi.API/Extensions/ServiceCollectionExtensions.cs
+++ b/src/Meezi.API/Extensions/ServiceCollectionExtensions.cs
@@ -91,6 +91,7 @@ public static class ServiceCollectionExtensions
         services.AddScoped<IQueueService, QueueService>();
         services.AddScoped<IShiftService, ShiftService>();
         services.AddScoped<IExpenseService, ExpenseService>();
+        services.AddScoped<IDemoSeedService, DemoSeedService>();
         services.AddScoped<ReceiptBuilder>();
         services.AddScoped<IPrinterService, NetworkPrinterService>();
         services.AddHttpClient(nameof(PosDeviceService));
diff --git a/src/Meezi.API/Services/DemoSeedService.cs b/src/Meezi.API/Services/DemoSeedService.cs
new file mode 100644
index 0000000..c3021b5
--- /dev/null
+++ b/src/Meezi.API/Services/DemoSeedService.cs
@@ -0,0 +1,172 @@
+using Meezi.Core.Entities;
+using Meezi.Infrastructure.Data;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+
+namespace Meezi.API.Services;
+
+public record DemoSeedResult(
+    int CategoriesAdded,
+    int ItemsAdded,
+    int TablesAdded,
+    int IngredientsAdded,
+    bool TaxCreated);
+
+public interface IDemoSeedService
+{
+    Task<DemoSeedResult> SeedAsync(string cafeId, CancellationToken ct = default);
+}
+
+public class DemoSeedService : IDemoSeedService
+{
+    private readonly AppDbContext _db;
+    private readonly ILogger<DemoSeedService> _logger;
+
+    public DemoSeedService(AppDbContext db, ILogger<DemoSeedService> logger)
+    {
+        _db = db;
+        _logger = logger;
+    }
+
+    public async Task<DemoSeedResult> SeedAsync(string cafeId, CancellationToken ct = default)
+    {
+        // 1. Ensure 9% default tax
+        var taxId = $"{cafeId}_demo_tax";
+        var taxCreated = false;
+        if (!await _db.Taxes.AnyAsync(t => t.CafeId == cafeId && t.IsDefault, ct))
+        {
+            _db.Taxes.Add(new Tax
+            {
+                Id = taxId,
+                CafeId = cafeId,
+                Name = "مالیات ارزش افزوده",
+                Rate = 9,
+                IsDefault = true,
+                IsRequired = true,
+                IsCompound = false
+            });
+            await _db.SaveChangesAsync(ct);
+            taxCreated = true;
+        }
+        else
+        {
+            taxId = await _db.Taxes
+                .Where(t => t.CafeId == cafeId && t.IsDefault)
+                .Select(t => t.Id)
+                .FirstAsync(ct);
+        }
+
+        // 2. Seed menu (categories + items) using café-agnostic seeder
+        var beforeCats = await _db.MenuCategories.CountAsync(c => c.CafeId == cafeId, ct);
+        var beforeItems = await _db.MenuItems.CountAsync(i => i.CafeId == cafeId, ct);
+        await DemoMenuSeeder.EnsureMenuAsync(_db, cafeId, taxId, _logger);
+        var afterCats = await _db.MenuCategories.CountAsync(c => c.CafeId == cafeId, ct);
+        var afterItems = await _db.MenuItems.CountAsync(i => i.CafeId == cafeId, ct);
+
+        // 3. Seed ingredients if warehouse is empty
+        var ingredientsAdded = 0;
+        if (!await _db.Ingredients.AnyAsync(i => i.CafeId == cafeId, ct))
+        {
+            var demoIngredients = BuildDemoIngredients(cafeId);
+            _db.Ingredients.AddRange(demoIngredients);
+            await _db.SaveChangesAsync(ct);
+            ingredientsAdded = demoIngredients.Count;
+        }
+
+        // 4. Seed 10 tables if no tables exist for this café's first active branch
+        var tablesAdded = 0;
+        if (!await _db.Tables.AnyAsync(t => t.CafeId == cafeId, ct))
+        {
+            var branchId = await _db.Branches
+                .Where(b => b.CafeId == cafeId && b.IsActive && b.DeletedAt == null)
+                .OrderBy(b => b.Id)
+                .Select(b => b.Id)
+                .FirstOrDefaultAsync(ct);
+
+            if (branchId is not null)
+            {
+                var tables = BuildDemoTables(cafeId, branchId);
+                _db.Tables.AddRange(tables);
+                await _db.SaveChangesAsync(ct);
+                tablesAdded = tables.Count;
+            }
+        }
+
+        _logger.LogInformation(
+            "Demo seed complete for cafe {CafeId}: +{Cats} cats, +{Items} items, +{Tables} tables, +{Ing} ingredients, tax={TaxCreated}",
+            cafeId, afterCats - beforeCats, afterItems - beforeItems, tablesAdded, ingredientsAdded, taxCreated);
+
+        return new DemoSeedResult(
+            CategoriesAdded: afterCats - beforeCats,
+            ItemsAdded: afterItems - beforeItems,
+            TablesAdded: tablesAdded,
+            IngredientsAdded: ingredientsAdded,
+            TaxCreated: taxCreated);
+    }
+
+    private static List<Ingredient> BuildDemoIngredients(string cafeId) =>
+    [
+        Ingredient(cafeId, "قهوه اسپرسو", "گرم", 2000, 500, 80, 2000),
+        Ingredient(cafeId, "شیر", "میلی‌لیتر", 10000, 2000, 15, 10000),
+        Ingredient(cafeId, "شکر", "گرم", 5000, 1000, 5, 5000),
+        Ingredient(cafeId, "وانیل", "میلی‌لیتر", 500, 100, 50, 500),
+        Ingredient(cafeId, "شکلات تلخ", "گرم", 1000, 200, 120, 1000),
+        Ingredient(cafeId, "خامه", "میلی‌لیتر", 2000, 500, 30, 2000),
+        Ingredient(cafeId, "دارچین", "گرم", 300, 50, 40, 300),
+        Ingredient(cafeId, "چای سیاه", "گرم", 1000, 200, 60, 1000),
+        Ingredient(cafeId, "آب معدنی", "میلی‌لیتر", 20000, 5000, 3, 20000),
+        Ingredient(cafeId, "نان تست", "عدد", 100, 20, 8000, 100),
+        Ingredient(cafeId, "تخم‌مرغ", "عدد", 60, 12, 6000, 60),
+        Ingredient(cafeId, "کره", "گرم", 500, 100, 80, 500),
+        Ingredient(cafeId, "پنیر", "گرم", 1000, 200, 90, 1000),
+        Ingredient(cafeId, "اسپاتولا یخ", "عدد", 200, 50, 2000, 200),
+        Ingredient(cafeId, "سس کارامل", "میلی‌لیتر", 1000, 200, 60, 1000),
+    ];
+
+    private static Ingredient Ingredient(
+        string cafeId, string name, string unit,
+        decimal qty, decimal reorder, decimal cost, decimal par) =>
+        new()
+        {
+            Id = $"{cafeId}_ing_{Guid.NewGuid():N}"[..36],
+            CafeId = cafeId,
+            Name = name,
+            Unit = unit,
+            QuantityOnHand = qty,
+            ReorderLevel = reorder,
+            UnitCost = cost,
+            ParLevel = par,
+            LowStockWarningPercent = 20m
+        };
+
+    private static List<Table> BuildDemoTables(string cafeId, string branchId)
+    {
+        var tables = new List<Table>();
+        // Floor 1: tables 1-4
+        for (var i = 1; i <= 4; i++)
+            tables.Add(Table(cafeId, branchId, i.ToString(), 4, "طبقه اول", i));
+        // Floor 2: tables 5-8
+        for (var i = 5; i <= 8; i++)
+            tables.Add(Table(cafeId, branchId, i.ToString(), 4, "طبقه دوم", i));
+        // VIP: tables 9-10
+        for (var i = 9; i <= 10; i++)
+            tables.Add(Table(cafeId, branchId, i.ToString(), 6, "VIP", i));
+        return tables;
+    }
+
+    private static Table Table(
+        string cafeId, string branchId, string number, int capacity, string floor, int sortOrder) =>
+        new()
+        {
+            Id = $"{cafeId}_tbl_{Guid.NewGuid():N}"[..36],
+            CafeId = cafeId,
+            BranchId = branchId,
+            Number = number,
+            Capacity = capacity,
+            Floor = floor,
+            SortOrder = sortOrder,
+            QrCode = Guid.NewGuid().ToString("N"),
+            IsActive = true,
+            IsCleaning = false
+        };
+}
diff --git a/web/dashboard/src/components/demo/demo-data-banner.tsx b/web/dashboard/src/components/demo/demo-data-banner.tsx
new file mode 100644
index 0000000..54ee68d
--- /dev/null
+++ b/web/dashboard/src/components/demo/demo-data-banner.tsx
@@ -0,0 +1,95 @@
+"use client";
+
+import { useState } from "react";
+import { useMutation, useQueryClient } from "@tanstack/react-query";
+import { Sparkles, Loader2 } from "lucide-react";
+import { apiPost } from "@/lib/api/client";
+import { useAuthStore } from "@/lib/stores/auth.store";
+import { Button } from "@/components/ui/button";
+import { cn } from "@/lib/utils";
+
+interface DemoSeedResult {
+  categoriesAdded: number;
+  itemsAdded: number;
+  tablesAdded: number;
+  ingredientsAdded: number;
+  taxCreated: boolean;
+}
+
+interface Props {
+  /** Which queries to invalidate after seeding. */
+  invalidateKeys: string[][];
+  className?: string;
+}
+
+export function DemoDataBanner({ invalidateKeys, className }: Props) {
+  const cafeId = useAuthStore((s) => s.user?.cafeId);
+  const role = useAuthStore((s) => s.user?.role);
+  const qc = useQueryClient();
+  const [done, setDone] = useState(false);
+  const [summary, setSummary] = useState<DemoSeedResult | null>(null);
+
+  const seed = useMutation({
+    mutationFn: () =>
+      apiPost<DemoSeedResult>(`/api/cafes/${cafeId}/demo/seed`, {}),
+    onSuccess: (result) => {
+      setSummary(result);
+      setDone(true);
+      for (const key of invalidateKeys) {
+        qc.invalidateQueries({ queryKey: key });
+      }
+    },
+  });
+
+  if (!cafeId || (role !== "Owner" && role !== "Manager")) return null;
+  if (done && summary) {
+    return (
+      <div
+        className={cn(
+          "flex items-center gap-3 rounded-xl border border-[#0F6E56]/30 bg-[#E1F5EE] px-4 py-3 text-sm text-[#0F6E56]",
+          className
+        )}
+      >
+        <Sparkles className="size-4 shrink-0" />
+        <span>
+          داده‌های نمونه اضافه شد — {summary.categoriesAdded} دسته،{" "}
+          {summary.itemsAdded} آیتم، {summary.tablesAdded} میز،{" "}
+          {summary.ingredientsAdded} ماده اولیه
+          {summary.taxCreated ? "، مالیات ۹٪" : ""}.
+        </span>
+      </div>
+    );
+  }
+
+  return (
+    <div
+      className={cn(
+        "flex flex-col gap-3 rounded-xl border border-dashed border-[#0F6E56]/40 bg-[#E1F5EE]/40 px-5 py-4 sm:flex-row sm:items-center sm:justify-between",
+        className
+      )}
+    >
+      <div className="flex items-center gap-3">
+        <Sparkles className="size-5 shrink-0 text-[#0F6E56]" />
+        <div>
+          <p className="text-sm font-semibold text-[#0F6E56]">شروع سریع با داده‌های نمونه</p>
+          <p className="text-xs text-muted-foreground mt-0.5">
+            ۷ دسته، ۵۹+ آیتم منو، ۱۰ میز، ۱۵ ماده اولیه و مالیات ۹٪ به‌صورت خودکار اضافه می‌شود.
+          </p>
+        </div>
+      </div>
+      <Button
+        size="sm"
+        className="shrink-0 bg-[#0F6E56] hover:bg-[#0c5a46]"
+        disabled={seed.isPending}
+        onClick={() => seed.mutate()}
+      >
+        {seed.isPending ? (
+          <Loader2 className="me-1.5 size-4 animate-spin" />
+        ) : (
+          <Sparkles className="me-1.5 size-4" />
+        )}
+        افزودن داده‌های نمونه
+      </Button>
+    </div>
+  );
+}
diff --git a/web/dashboard/src/components/inventory/inventory-screen.tsx b/web/dashboard/src/components/inventory/inventory-screen.tsx
index d4a2319..ae4df5e 100644
--- a/web/dashboard/src/components/inventory/inventory-screen.tsx
+++ b/web/dashboard/src/components/inventory/inventory-screen.tsx
@@ -5,6 +5,7 @@ import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
 import { useTranslations, useLocale } from "next-intl";
 import { Link } from "@/i18n/routing";
 import { Pencil } from "lucide-react";
+import { DemoDataBanner } from "@/components/demo/demo-data-banner";
 import { apiGet, apiPatch, apiPost, apiPut } from "@/lib/api/client";
 import { InventoryUnitField } from "@/components/inventory/inventory-unit-field";
 import { useAuthStore } from "@/lib/stores/auth.store";
@@ -366,7 +367,17 @@ export function InventoryScreen() {
           {isLoading ? (
             <p className="text-sm text-muted-foreground">{tCommon("loading")}</p>
           ) : ingredients.length === 0 ? (
-            <p className="text-sm text-muted-foreground">{t("empty")}</p>
+            <div className="space-y-3">
+              <DemoDataBanner
+                invalidateKeys={[
+                  ["inventory", cafeId!],
+                  ["menu-categories", cafeId!],
+                  ["menu-items-all", cafeId!],
+                  ["tables-board", cafeId!],
+                ]}
+              />
+              <p className="text-sm text-muted-foreground">{t("empty")}</p>
+            </div>
           ) : (
             <div className="grid gap-3 sm:grid-cols-2 lg:grid-cols-3">
               {ingredients.map((ing) => {
diff --git a/web/dashboard/src/components/menu/menu-admin-screen.tsx b/web/dashboard/src/components/menu/menu-admin-screen.tsx
index dace65f..8689802 100644
--- a/web/dashboard/src/components/menu/menu-admin-screen.tsx
+++ b/web/dashboard/src/components/menu/menu-admin-screen.tsx
@@ -5,6 +5,7 @@ import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
 import { useLocale, useTranslations } from "next-intl";
 import { useIsRtl } from "@/lib/use-is-rtl";
 import { Box, Pencil, Plus, Search, Video, X } from "lucide-react";
+import { DemoDataBanner } from "@/components/demo/demo-data-banner";
 import { Menu3dUpload } from "@/components/media/menu-3d-upload";
 import { MenuAi3dGenerate } from "@/components/media/menu-ai-3d-generate";
 import { CategoryVisual } from "@/components/menu/category-visual";
@@ -449,7 +450,19 @@ export function MenuAdminScreen() {
         )
       ) : (
         /* ── Catalog tab ─────────────────────────────────────────────────── */
-        <div className="flex min-h-0 gap-4">
+        <div className="flex min-h-0 flex-col gap-4">
+          {categories.length === 0 && items.length === 0 && (
+            <DemoDataBanner
+              invalidateKeys={[
+                ["menu-categories", cafeId],
+                ["menu-items-all", cafeId],
+                ["menu-items", cafeId],
+                ["tables-board", cafeId],
+                ["inventory", cafeId],
+              ]}
+            />
+          )}
+          <div className="flex min-h-0 gap-4">
 
           {/* ── Category Sidebar (desktop) ─────────────────────────────── */}
           <aside className="hidden w-52 shrink-0 lg:block">
@@ -752,6 +765,7 @@ export function MenuAdminScreen() {
               </div>
             )}
           </div>
+          </div>
         </div>
       )}
 
diff --git a/web/dashboard/src/components/tables/tables-screen.tsx b/web/dashboard/src/components/tables/tables-screen.tsx
index 8079644..92654db 100644
--- a/web/dashboard/src/components/tables/tables-screen.tsx
+++ b/web/dashboard/src/components/tables/tables-screen.tsx
@@ -5,6 +5,7 @@ import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
 import { useTranslations } from "next-intl";
 import * as signalR from "@microsoft/signalr";
 import { Plus, QrCode, Pencil, Video, Trash2, Copy, ExternalLink } from "lucide-react";
+import { DemoDataBanner } from "@/components/demo/demo-data-banner";
 import { notify } from "@/lib/notify";
 import { MediaPairUpload } from "@/components/media/media-pair-upload";
 import { PageHeader } from "@/components/layout/page-header";
@@ -346,9 +347,19 @@ export function TablesScreen() {
       {isLoading ? (
         <p className="text-sm text-muted-foreground">{tCommon("loading")}</p>
       ) : tables.length === 0 ? (
-        <p className="text-sm text-muted-foreground">
-          {branchId ? t("emptyBranch") : t("empty")}
-        </p>
+        <div className="space-y-3">
+          <DemoDataBanner
+            invalidateKeys={[
+              ["tables-board", cafeId],
+              ["menu-categories", cafeId],
+              ["menu-items-all", cafeId],
+              ["inventory", cafeId],
+            ]}
+          />
+          <p className="text-sm text-muted-foreground">
+            {branchId ? t("emptyBranch") : t("empty")}
+          </p>
+        </div>
       ) : (
         <>
           {actionMessage ? (