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Hull and slice fresh strawberries. Toss with 3 tsp sugar and cover. Let sit in fridge overnight, until they become macerated and juicy. Blend strawberries with short pulses, just until pureed. Do not over blend.
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Preheat oven to 350F with rack on lower middle. Line bottom of two 8- or 9-inch round pans with parchment paper. Grease and flour the paper and sides of pans.
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Beat butter and sugar in stand mixer with paddle attachment on medium high, until light and fluffy, about 5 minutes.
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Add milk, yolks, vanilla, and 3/4 cup of strawberry puree – save remaining puree for frosting, filling, or other use. Blend just until combined.
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In separate bowl, whisk together: sifted cake flour, baking powder, and salt. Fold in the butter mixture with rubber spatula, just until wet/dry ingredients are fully incorporated. Do not over mix.
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In a clean bowl, using electric mixer, beat egg whites just until still peaks form. Gently fold egg whites into the cake batter with rubber spatula, softly folding until combined.
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Divide batter evenly among the two pans. Give the pans a gentle shake to level out the tops.
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Bake 20-25 minutes just until toothpick inserted in center has a few tender crumbs attached. Watch carefully so it does not over bake and become dry.
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Let cakes rest at room temp for 10 minutes and turn out onto wire racks. Let cool completely before frosting.