1kg Plum Cake Recipe: Moist Spice Layers With Jammy Fruit Filling

This 1kg plum cake recipe delivers layers of moist spice cake and jammy plum filling that stays fresh for days—no dry crumbs in sight. 💛 The secret lies in precise measurements and a slow bake that ensures even moisture throughout each slice. I've perfected this version after years of testing, and it consistently yields a cake that's rich, fragrant, and perfect for special occasions.

The recipe combines warm spices like cinnamon and nutmeg with tender plums to create a flavor profile that's both comforting and sophisticated. You'll work with a simple batter that comes together in minutes, then layer it with homemade plum jam for that signature jammy texture. The cake bakes in a single sheet pan, making it easier to handle than traditional layer cakes while still delivering restaurant-quality results.

What you'll end up with is a homogeneous 1kg cake that's perfectly balanced—moist yet sturdy enough to slice cleanly, with plums that stay tender rather than mushy. The aroma alone will have everyone anticipating dessert, and each bite delivers that perfect harmony of spiced cake and sweet-tart plum filling. This cake holds up beautifully for gifting or serving at gatherings, keeping its moisture and flavor for up to five days.

Serve it at room temperature with a dusting of powdered sugar or a dollop of whipped cream for extra elegance. The rich flavors pair wonderfully with tea or coffee, making it an ideal dessert for brunch or afternoon gatherings. Let's get started on creating this showstopping plum cake!

Ingredients for 1kg plum cake

These 14 ingredients create a showstopping 1kg plum cake with layers of spice and jammy fruit.

The plums and jam are non-negotiable here—use ripe but firm plums for the best texture. Trader Joe's and Whole Foods often have perfect ones, but local markets beat grocery stores every time. For the jam, homemade is ideal, but Bon Appétit or Bonne Maman brands are solid if you're short on time. The spices? Penzeys has the best ground nutmeg, but regular grocery store stuff works fine. Just make sure it smells fresh—no dusty jars here.

No fresh plums? Frozen plums work too—just thaw and drain them first. Jam short on time? Applesauce mixed with lemon juice can stand in, though it won’t be as jammy. The cake batter can handle substitutions, but the filling is where flavor lives. Walnuts or almonds folded into the jam add texture if you're feeling fancy. And if you're out of vanilla extract, vanilla bean paste gives a deeper flavor—just use half the amount. The baking powder? Double-acting is best, but regular works in a pinch.

This cake keeps for 5 days at room temperature, wrapped tightly in plastic. For longer storage, 3 months in the freezer works beautifully—just thaw overnight before serving. The plums stay tender if you wrap them in parchment before freezing. Whipped cream? Make it ahead and store in the fridge—whip it just before serving for the best texture. And if you're gifting this, slice it while still warm for the cleanest cuts.

Step-by-step instructions for 1kg plum cake

Here's how to layer this cake like a pro—moist crumb, jammy plums, and all.

Preheat your oven to 350°F and grease two 9-inch round cake pans with butter, then line the bottoms with parchment paper. In a large mixing bowl, whisk together the 3.5 cups all-purpose flour, 2 tsp baking powder, 2 tsp ground cinnamon, 0.5 tsp ground nutmeg, and 0.5 tsp salt. Set aside.

In a separate bowl, cream together the 1 cup unsalted butter and 1.5 cups granulated sugar until light and fluffy—about 3-4 minutes. Add the 3 whole large eggs, one at a time, beating well after each addition. Mix in the 1 cup milk and 2 tsp vanilla extract until smooth. Gradually add the dry ingredients to the wet, mixing on low speed just until combined—don't overmix or your cake will turn tough.

While the batter rests, pit and halve the 2.5 lbs fresh plums, removing any hard pits. In a small saucepan, gently warm the 1.5 cups plum jam over low heat until it's soft and spreadable—about 2-3 minutes. Stir in 0.5 cup powdered sugar to sweeten the filling slightly. Let it cool for 10 minutes to thicken.

Here's the thing—don't skip the sugar. It balances the tartness of the plums and jam, making every bite perfectly sweet-tart. If you're using underripe plums, add an extra 1-2 tablespoons of sugar to the filling.

Divide the batter evenly between the two prepared cake pans. Spoon about ½ cup of the warm plum filling onto each layer, spreading it evenly. The filling should be visible through the batter—this ensures that jammy flavor in every bite. Pour the remaining batter over the filling in each pan.

Bake for 30-35 minutes or until a toothpick inserted into the center comes out clean. Rotate the pans halfway through baking for even browning. The cake should be golden brown and spring back when gently pressed in the center. Let the cakes cool in the pans for 10 minutes before transferring to a wire rack to cool completely.

Once both cakes are completely cool, place one cake layer on a serving plate. Spread about ¾ cup of the remaining plum filling evenly over the top. Place the second cake layer on top and gently press down to create a sealed sandwich. Chill the assembled cake in the refrigerator for at least 1 hour to let the filling set.

While the cake chills, whip the 1 cup heavy cream to soft peaks. Dust the top of the cake with the remaining powdered sugar and spread the whipped cream evenly over the surface. This adds that final touch of elegance and balances the rich plum flavors.

Slice the cake into 12 equal wedges and serve at room temperature. The cake should be moist with a tender crumb, and each bite should deliver bursts of jammy plum filling. For best results, serve within 2-3 days—the flavors will deepen as it sits.

Pro tip: If you're making this ahead, wrap the assembled cake tightly in plastic wrap and store in the fridge. Bring it to room temperature before serving for the best texture and flavor experience.

Best sauces and condiments for this dish

Classic Vanilla Cream

Whipped vanilla cream is the quintessential pairing for plum cake—it cuts through the richness while adding a delicate sweetness. I fold in 1 tsp vanilla extract and ¼ tsp ground cinnamon to the 1 cup heavy cream before whipping to soft peaks. For extra elegance, dust the cake with powdered sugar before adding the cream. This combo enhances the cake’s spiced notes without overpowering them. 💫

Spiced Caramel Sauce

For a sophisticated twist, drizzle warm spiced caramel sauce over each slice. Simmer ½ cup granulated sugar with ¼ cup heavy cream and 1 tbsp unsalted butter until golden, then stir in ½ tsp cinnamon and ¼ tsp nutmeg. Let it cool slightly before serving—it pairs beautifully with the tart plums and spiced cake layers. Store leftover sauce in an airtight container for up to 2 weeks.

Lemon Curd Swirl

Brighten the rich plum flavors with a swirl of homemade lemon curd. Mix ½ cup lemon juice, ½ cup granulated sugar, ¼ cup unsalted butter, and 2 egg yolks until thickened. Spread a thin layer between the cake layers or drizzle over slices. The acidity balances the sweetness, creating a refreshing contrast. Use a pastry bag for clean swirls or simply spoon it on for a rustic look.

Warm Plum Compote

Elevate your serving by offering warm plum compote on the side. Simmer 1 cup pitted plums, 2 tbsp granulated sugar, and 1 tsp vanilla extract until the fruit breaks down slightly. Strain and serve warm—it’s like a grown-up version of the cake’s filling. This adds a fresh, fruity dimension that complements the baked cake beautifully. 🍑

Honey-Drizzled Whipped Cream

For a lighter touch, drizzle 1 tbsp honey over the whipped cream before spreading it on the cake. The honey’s floral notes harmonize with the plum’s tartness while adding a subtle depth. Use raw honey for a more complex flavor, or acacia honey for a delicate sweetness. This finishing touch feels luxurious without being heavy.

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