diff --git a/src/lib/server/shopping/repository.ts b/src/lib/server/shopping/repository.ts
index 39432bd..bd0e338 100644
--- a/src/lib/server/shopping/repository.ts
+++ b/src/lib/server/shopping/repository.ts
@@ -47,8 +47,11 @@ export function addRecipeToCart(
   ).run(recipeId, resolved, profileId);
 }
 
-export function removeRecipeFromCart(_db: Database.Database, _recipeId: number): void {
-  throw new Error('not implemented');
+export function removeRecipeFromCart(
+  db: Database.Database,
+  recipeId: number
+): void {
+  db.prepare('DELETE FROM shopping_cart_recipe WHERE recipe_id = ?').run(recipeId);
 }
 
 export function setCartServings(
diff --git a/tests/integration/shopping-repository.test.ts b/tests/integration/shopping-repository.test.ts
index 2487f2d..388e310 100644
--- a/tests/integration/shopping-repository.test.ts
+++ b/tests/integration/shopping-repository.test.ts
@@ -3,6 +3,7 @@ import { openInMemoryForTest } from '../../src/lib/server/db';
 import { insertRecipe } from '../../src/lib/server/recipes/repository';
 import {
   addRecipeToCart,
+  removeRecipeFromCart,
   listShoppingList
 } from '../../src/lib/server/shopping/repository';
 import type { Recipe } from '../../src/lib/types';
@@ -63,3 +64,23 @@ describe('addRecipeToCart', () => {
     expect(listShoppingList(db).recipes[0].servings).toBe(4);
   });
 });
+
+describe('removeRecipeFromCart', () => {
+  it('deletes only the given recipe', () => {
+    const db = openInMemoryForTest();
+    const a = insertRecipe(db, recipe({ title: 'A' }));
+    const b = insertRecipe(db, recipe({ title: 'B' }));
+    addRecipeToCart(db, a, null);
+    addRecipeToCart(db, b, null);
+    removeRecipeFromCart(db, a);
+    const snap = listShoppingList(db);
+    expect(snap.recipes).toHaveLength(1);
+    expect(snap.recipes[0].recipe_id).toBe(b);
+  });
+
+  it('is idempotent when recipe is not in cart', () => {
+    const db = openInMemoryForTest();
+    const id = insertRecipe(db, recipe());
+    expect(() => removeRecipeFromCart(db, id)).not.toThrow();
+  });
+});