This Strawberry Rhubarb Layer Cake is a perfect mix of sweet and tangy, with soft layers of cake sandwiched between fruity strawberry and rhubarb filling. The vibrant pink color and fresh berry flavor make it look as good as it tastes, and the slight tartness from the rhubarb adds a lovely twist that keeps every bite interesting.
I love making this cake when strawberries are in season because it really brings out the best of both fruits. The filling is just the right balance of juicy and thick, so it doesn’t make the cake soggy but still stays wonderfully moist. Sometimes, I add a little extra whipped cream on top because who can say no to more creaminess?
This cake always feels like a special treat, whether it’s for a family gathering or a weekend afternoon with friends. I enjoy serving it with a cup of tea or a glass of cold milk, and it’s the kind of dessert that gets everyone asking for a second slice. It’s simple, fresh, and full of happy flavors that remind me of warm days and good company.
Key Ingredients & Substitutions
All-Purpose Flour: This gives the cake structure and light crumb. You can swap half with cake flour for a softer texture.
Butter & Sugar: Butter adds richness, while sugar sweetens and helps tenderize. Unsalted butter lets you control salt balance.
Strawberries & Rhubarb: Fresh is best for bright flavor. If rhubarb isn’t available, try adding more strawberries or using frozen berries.
Cornstarch in Filling: It thickens the fruit mixture so it won’t seep into the cake. If you don’t have cornstarch, arrowroot powder works well too.
Heavy Cream for Frosting: Whipping cream makes a light, fluffy frosting. For a non-dairy option, try coconut cream chilled overnight.
How Do I Get the Fruit Filling Thick and Not Watery?
Making sure the strawberry rhubarb filling isn’t too runny is key to keeping your cake layers moist but not soggy. Here’s how:
- Combine chopped fruit with sugar, lemon juice, and cornstarch before cooking.
- Cook over medium heat, stirring constantly until thick and bubbling—about 10-12 minutes.
- Let the filling cool completely; it will thicken more as it cools down.
Be patient and don’t rush this step. The cornstarch helps prevent excess liquid from leaking into the cake, giving you a nice, spreadable texture.
Equipment You’ll Need
- Three 8-inch round cake pans – I like using these because they bake the layers evenly and are just the right size for this cake.
- Mixing bowls and whisk – perfect for mixing the cake batter and fruit filling without any lumps.
- Electric hand or stand mixer – makes whipping the cream quick and effortless, resulting in fluffy frosting.
- Saucepan – essential for cooking the strawberry rhubarb filling to get it thick and jammy.
- Spatula and spoon – helps spread the filling and frosting evenly between layers.
- Cooling racks – cool the cake layers completely to prevent sagging or melting the frosting.
Flavor Variations & Add-Ins
- Use blueberries or raspberries instead of strawberries for a different berry flavor that pairs well with rhubarb.
- Swap vanilla extract for almond or lemon extract to add a citrus or nutty note to the cake or frosting.
- Add chopped fresh mint or basil into the filling for a fresh herbal twist.
- Mix in a splash of bourbon or Amaretto in the filling for a richer, boozy flavor.
Strawberry Rhubarb Layer Cake
Ingredients You’ll Need:
For the Cake:
- 2 ¾ cups (345g) all-purpose flour
- 1 tbsp baking powder
- ½ tsp salt
- 1 cup (230g) unsalted butter, softened
- 1 ¾ cups (350g) granulated sugar
- 4 large eggs, room temperature
- 1 tbsp pure vanilla extract
- 1 cup (240ml) whole milk, room temperature
For the Strawberry Rhubarb Filling:
- 2 cups fresh strawberries, hulled and chopped
- 1 ½ cups rhubarb, chopped (about 3-4 stalks)
- ¾ cup granulated sugar
- 1 tbsp cornstarch
- 1 tsp lemon juice
For the Frosting:
- 1 ½ cups (360ml) heavy cream, cold
- ¼ cup (30g) powdered sugar
- 1 tsp pure vanilla extract
Garnish:
- Fresh strawberries
- Edible flowers (optional)
How Much Time Will You Need?
This cake takes about 30 minutes to prepare, around 25-30 minutes to bake, plus time to make the filling and frosting. You’ll also want to chill it for at least 1 hour before serving to let everything set perfectly. Overall, plan for about 2 to 2 ½ hours from start to finish.
Step-by-Step Instructions:
1. Prepare the Cake Layers:
First, preheat your oven to 350°F (175°C) and grease and flour three 8-inch round cake pans. In a medium bowl, whisk together the flour, baking powder, and salt. In a large bowl, use an electric mixer to beat the softened butter with the granulated sugar until it’s light and fluffy—about 3 to 4 minutes.
Add the eggs one at a time, making sure each is well mixed before adding the next. Stir in the vanilla extract. Then, alternate adding the dry ingredients and milk to the butter mixture, starting and ending with the dry ingredients. Be careful to mix just until combined.
Divide your batter evenly among the pans and smooth the tops. Bake for 25 to 30 minutes, or until a toothpick inserted into the center comes out clean. Let the cakes cool in their pans for 10 minutes, then turn them out onto wire racks to cool completely.
2. Make the Strawberry Rhubarb Filling:
Put the chopped strawberries, rhubarb, sugar, cornstarch, and lemon juice into a medium saucepan. Cook this mixture over medium heat, stirring often, until it thickens and the fruit becomes soft—this should take about 10 to 12 minutes. Take it off the heat and let it cool completely. It will continue to thicken as it cools.
3. Make the Whipped Cream Frosting:
Chill a mixing bowl and beaters in the fridge for a few minutes. Then, pour the cold heavy cream into the chilled bowl, add powdered sugar and vanilla extract, and beat until you get stiff peaks. This means when you lift the mixer, the cream stands up firmly.
4. Assemble the Cake:
Place one cake layer on your serving plate. Spread a layer of whipped cream over it, then spoon over some of the strawberry rhubarb filling and spread gently. Repeat this with the second cake layer and filling. Place the final cake layer on top.
Use the remaining whipped cream to frost the top and sides of the cake evenly. Spoon the remaining strawberry rhubarb filling over the top for a beautiful, vibrant finish.
5. Garnish and Serve:
Decorate with fresh strawberries and edible flowers if you like. Chill the cake for at least one hour before serving to let all the flavors meld and the cake set nicely. When ready, slice and enjoy your fresh, fruity, and creamy strawberry rhubarb cake!
Can I Use Frozen Strawberries and Rhubarb for the Filling?
Yes! Just make sure to thaw them fully and drain any excess liquid before cooking to avoid a watery filling. You might need to cook the filling a little longer to achieve the right thickness.
How Should I Store Leftover Cake?
Keep leftover cake refrigerated in an airtight container for up to 3 days. The whipped cream frosting is best enjoyed fresh, so try to eat it within a couple of days for the best texture and flavor.
Can I Make the Cake Layers Ahead of Time?
Absolutely! Bake the cake layers a day in advance, wrap them tightly in plastic wrap, and store at room temperature or in the fridge. Bring them to room temperature before assembling for the best results.
What Can I Use Instead of Whipped Cream Frosting?
You can substitute a cream cheese frosting or a mascarpone-based frosting for a richer, tangier twist. Just note that these frostings are thicker and heavier than whipped cream, so it changes the texture slightly.