2 1/4 cups cake flour (not self-rising)
1 1/2 cups granulated sugar, divided
2 1/4 teaspoons baking powder
3/4 teaspoon salt
1/2 cup safflower oil
7 large egg yolks plus 9 large egg whites
3/4 cup whole milk
1/2 teaspoon cream of tartar
1 whole vanilla bean, split and scraped, or 2 teaspoons pure vanilla extract
2 pounds strawberries, hulled and halved or quartered (about 5 cups), plus more for serving
1/2 cup granulated sugar
1 tablespoon fresh lemon juice
Pinch of salt
2 cups cold heavy cream
1/4 cup confectioners' sugar, plus more for sprinkling