INGREDIENTS
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3 cups flour
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1 tsp. baking soda
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1 tsp. baking powder
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1 1/4 tsp. salt
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3/4 cup unsweetened Dutch-process cocoa powder
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3/4 cup hot water
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1 1/2 cups unsalted butter
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2 1/4 cups sugar
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4 eggs
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1 tbsp. + 1 tsp. vanilla extract
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1 cup sour cream
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1 cup coarsely chopped fresh strawberries
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1 cup (2 sticks) unsalted butter, at room temperature
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3 cups confectioners’ sugar, sifted
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1 (7 ounce) jar Marshmallow fluff
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1/8 teaspoon salt