Polish-Style Triple Berry Hibiscus Kisiel Cake

There are some cakes that feel less like a recipe and more like a memory—and this is one of them. For my birthday this year, I wanted something special, something that felt like “me.” And when I told my Babcia about the idea of making a kisiel cake, she lit up the same way she always does when we’re in the kitchen together.

Growing up, she often baked traditional biszkopt cakes—light, airy sponges topped with fruit or a simple dusting of powdered sugar. But this cake is different. A kisiel sponge is softer, denser, and almost custard-like thanks to the addition of flavored kisiel powder (a Polish fruit pudding mix). It’s moist in a way that traditional sponge never is, and the flavor carries right through the layers. Honestly, the texture is unlike any cake I’ve ever had.

So, together in her cozy kitchen—three generations crowded around the counter—we whisked, sifted, simmered, and (of course) taste-tested. There was flour on the counter, berries on the floor, and laughter everywhere. At one point, Babcia and I even ended up sharing a slice off the same plate before the cake was fully decorated. It felt like a little scene from a rom-com, except cozier and full of powdered sugar.

The finished cake? A Polish-style strawberry and hibiscus kisiel sponge, brushed with hibiscus tea syrup, layered with a homemade berry compote, frosted in strawberry-raspberry buttercream, and topped with a whole mountain of fresh berries. It’s sweet, tart, floral, and dramatic in all the best ways—kind of like me.

This cake may have started as a birthday treat, but it turned into something much more special: a little bridge between generations, a taste of tradition with a twist, and a reminder that the best cakes aren’t just baked—they’re shared.

Ingredients

Cake Batter:

• 5 large eggs
• 1 cup powdered sugar
• ¾ cup all-purpose flour
• 1 tsp baking powder
• 1 tsp salt
• 1 packet strawberry or poziomkowe (wild strawberry) kisiel powder

Berry Compote Filling:

• 1½ cups fresh mixed berries
• 2–3 tbsp sugar (to taste)
• 2 tbsp cornstarch or mąka ziemniaczana
• 1 tbsp lemon juice

Buttercream:

• 300 g unsalted butter, room temperature
• 300 g powdered sugar (or more to taste)
• 1 tbsp crushed dried raspberries
• 2–3 fresh strawberries, mashed
• 2 tsp vanilla extract

Berry Topping:

• 3 cups fresh mixed berries (strawberries, raspberries, blueberries)

Soak:

• ½ cup brewed hibiscus tea
• 2 tbsp sugar
• Juice of ½ lemon

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Method

1. Preheat oven to 350°F (175°C). Grease and line your cake pans.
2. Whisk eggs and powdered sugar until light, fluffy, and doubled in volume.
3. Sift in flour, baking powder, salt, and kisiel powder. Fold gently until just combined.
4. Pour batter into prepared pans and bake for ~25 minutes, or until a toothpick comes out clean. Let cool completely.
5. For the berry compote: simmer berries with sugar, lemon juice, and starch until thickened. Cool before using.
6. For the buttercream: beat butter until light, then add powdered sugar, mashed strawberries, dried raspberries, and vanilla. Whip until fluffy.
7. Mix hibiscus tea with sugar and lemon juice. Brush over cooled cakes for extra flavor and moisture.
8. Assemble: spread a layer of compote and buttercream between cakes. Frost the outside with the remaining buttercream.
9. Decorate with a generous pile of fresh berries on top. Chill before slicing and serving.