Strawberry-Swirl Bundt Cake

Preheat oven to 350°F, with a rack in center. Brush a 10-to-15-cup Bundt pan with butter; dust with flour, tapping out excess. Whisk together egg whites, milk, and vanilla. Beat butter with 1 3/4 teaspoons salt, baking powder, and 1 3/4 cups granulated sugar on medium-high speed until light and fluffy, 2 to 3 minutes.

Beat in flour in three additions, alternating with egg-white mixture, and beginning and ending with flour. (You should have about 7 cups batter.) Separate 2 cups batter and stir in freeze-dried strawberries.

Transfer 1/4 cup strawberry batter to a small bowl; stir in pink gel paste until combined. Stir mixture back into remaining strawberry batter a little at a time, until you achieve desired color.

Spoon 2 1/2 cups vanilla batter into bottom of pan. Top with all of strawberry batter, then remaining vanilla. Run a butter knife through batter four times to swirl, then use to fold and swoop in a couple of places to further marble.

Place pan in oven; reduce temperature to 325°F. Bake until top of cake springs back when lightly touched, 1 hour to 1 hour and 5 minutes. Let cool in pan on a wire rack 15 minutes, then turn out onto rack and let cool completely.

Stir together strawberries, remaining 3 tablespoons granulated sugar, and a pinch of salt; let stand until sugar dissolves, about 15 minutes. Meanwhile, beat cream with confectioners' sugar on high speed to soft peaks. Dust cake with more confectioners' sugar and serve with whipped cream and macerated berries.