Ingredients

  • 4 large eggs, separated
  • 1 teaspoon finely grated lemon zest
  • 13 cup lemon juice
  • 1 tablespoon unsalted butter, melted
  • 1 cup sugar
  • 1/2 cup all-purpose flour
  • 1/2 teaspoon kosher salt
  • 1 1/2 cups whole milk

Method

  • Place a large roasting pan on a rack in the center of the oven.
  • Fill the pan halfway with water.
  • With the pan inside, heat the oven to 350 degrees.
  • Butter an 8-inch square or round baking dish.
  • In a large bowl, whisk together the egg yolks, lemon zest, lemon juice and butter.
  • In another bowl, stir together the sugar, flour and salt.
  • Whisk half the flour mixture into the egg yolks, then half the milk.
  • Whisk in remaining flour mixture, then remaining milk.
  • Whip the egg whites until soft peaks form, then gently fold them into the batter.
  • Pour batter into the buttered dish.
  • Place the dish in the pan of water in the oven.
  • Bake until the cake is set, about 45 minutes.