Pre-heat the oven to 350°F.
In a standing mixer, cream the butter and 1 cup sugar. Add the salt, vanilla and egg yolks and mix until creamy.
Sift 1 1/2 cups flour and the baking powder together. Add the sifted flour and the milk to the yolk mixture and gently combine.
In another large bowl, beat the egg whites with 1/4 cup sugar until they make stiff peaks. Fold the whites into the batter. Coat the berries with 1 tablespoon flour and add to the batter.
Butter a round spring-form mold, line it with a round of parchment paper, then butter the paper. Pour in the batter and sprinkle with granulated sugar. Bake for 50 minutes, or until a cake tester comes out clean.
Serve with a whole lot of love, and maybe a dollop of whipped cream.