Ingredients
- 1 stick unsalted butter, melted and cooled, plus more, softened, for pan
- 1 ⅔ cups unbleached all-purpose flour
- 2 teaspoons baking powder
- 1 teaspoon kosher salt (we use Diamond Crystal)
- 4 large eggs, room temperature
- 1 ½ cups sugar
- 4 teaspoons finely grated lemon zest (from 2 lemons)
- 2 teaspoons pure vanilla paste or extract
- ¾ cup sour cream
- 1 ⅓ cups sugar
- ¼ teaspoon cream of tartar
- 4 large egg whites, room temperature
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