Marbled lemon blueberry butter cake OtherEasy45 min Send this recipe to a friend Print this page Ask a question to the author Post your photo of this recipe Ingredients 5 2 sticks (8 ounces) unsalted butter, at room temperature 2 cups sugar 2 tsp grated lemon zest 1½ tsp lemon extract 7 egg whites 3 cups cake flour 4 tsp baking powder ½ tsp salt 1¼ cups milk Fresh blueberries, for decoration 1) Lemon Buttercream Frosting: 1 cup sugar ¼ cup water 2 eggs 3 sticks (12 ounces) unsalted butter, at room temperature 2 tbsp freshly squeezed lemon juice suggest adding some zest as well for added flavour) View the directions