Prep the Pans: Preheat oven to 350°F. Grease and flour two 9-inch round cake pans.
Mix the Dry Ingredients: Sift cake flour, then measure out 2 ¾ cups. Add baking powder and baking soda, then sift again into a bowl.
Cream the Base: In a large bowl, beat sugar, butter, and dry Jello until light and fluffy (about 2 minutes). Add eggs one at a time, beating well and scraping down the bowl after each.
Combine the Batter: Alternate adding the flour mixture and buttermilk to the butter mixture, mixing gently. Stir in the strawberry purée and vanilla until combined.
Bake: Divide batter evenly between prepared pans. Bake for 25–30 minutes or until a toothpick comes out clean. Cool in pans for 10 minutes, then turn out onto a wire rack to cool completely.
Make the Frosting: Beat butter until fluffy. Add powdered sugar one cup at a time, beating until smooth. Stir in chopped strawberries. Adjust texture with more sugar (if too runny) or a splash of milk (if too thick). Add food coloring if desired.
Assemble the Cake: Spread frosting on the first cake layer. Add the second layer and frost the top and sides. Garnish with sliced fresh strawberries.
Chill & Serve: Refrigerate the cake for at least 1 hour before slicing.
Notes
Make sure to use sifted cake flour for accurate measuring.
Let the cakes cool completely before frosting.
Garnish just before serving to keep the strawberries fresh.
This cake keeps well in the fridge for up to 4 days. Store covered.
Strawberry Purée
To make the strawberry purée for your cake, here’s a super simple method:
What You’ll Need
About 1 cup of fresh or thawed frozen sweetened strawberries
A blender or food processor
Steps
Wash and hull the strawberries if using fresh.
Place the strawberries in a blender or food processor.
Blend until smooth.
Measure out ½ cup of the purée.
If using frozen sweetened strawberries, let them thaw first and then purée. You don’t need to add sugar since the cake already includes plenty.
If you want a smoother purée with no seeds, you can strain it through a fine mesh sieve, but it’s not required for this recipe.