Marbled lemon blueberry butter cake

Ingredients

• 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)

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Preparation

• Preheat the oven to 350 degrees F. Butter the bottom and sides of three 8 inch round cake pans. Line the bottom of each pan with a round of parchment or waxed paper and butter the paper.
• In a mixer, cream together the butter, sugar, lemon zest and lemon extract until light and fluffy. Gradually add the egg whites 2 or 3 at a time, beating well between additions and stopping occasionally to scrape down the sides of the bowl. Combine the flour, baking powder and salt, whisk gently to blend. In 2 or 3 alternating additions, beat the dry ingredients and milk into the butter mixture, scraping down the sides of the bowl several times. Beat on medium-high speed for about 1 minute to smooth out any lumps and aerate the batter.
• Scoop 1 cup of the batter into a small bowl. Divide the remaining equally among the 3 prepared pans, smoothing the tops with a spatula. This gives you a smooth surface to work with. Add 2½ tbsp of the lemon blueberry preserves to the reserved batter and blend well. Drizzle heaping teaspoons of this blueberry mixture over the batter in the pans. Use a skewer to swirl the blueberry mixture in short strokes to drag it down through the lemon batter without mixing it in.
• Bake for about 25 minutes or until a cake tester or skewer stuck in the centre comes out clean and the cake pulls away from the sides of the pan. Lat the layers cool for 10 minutes before turning out onto a wire rack, peeling off the paper and leaving to cool completely.
• 1) Lemon Buttercream Frosting:
  In a small saucepan, combine the sugar and water. Bring to the boil over a medium heat, stirring to dissolve the sugar. Continue to boil without stirring, occasionally washing down the sides of the pan with a wet pastry brush until the syrup reaches the soft-ball stage, 238 degrees F on a candy thermometer. Immediately remove from the heat.
• In a large mixer bowl with an electric mixer on medium speed, beast the eggs briefly. Slowly add the hot syrup in a thin stream, pouring it down the sides of the bowl; be careful to avoid hitting the beaters or the syrup may splatter. When all the syrup has been added, raise the speed to medium,-high and beat until the mixture is very fluffy and cooled to body temperature. This can take 15-20 minutes. Reduce the mixer speed to medium-low and gradually add the softened butter 2 to 3 tablespoons at a time, beating well between additions. As you?re adding the last few tablespoons of butter, the frosting will appear to break, then suddenly come together like whipped butter. Beat in the lemon juice, and the frosting is ready to use.
• To assemble the cake, place a layer, flat side up, on a cake stand. Spread half of the lemon blueberry preserves over the top. Place a second layer on top of the first and spread the remaining preserves over it. Finally place the third layer on top and frost the top and sides with the lemon buttercream.