Good-Cooking - Lemon Puddin' Cake

Ingredients

• 4 eggs, separated
• 1/3 cup lemon juice
• 1 teaspoon lemon zest
• 1 tablespoon butter
• 1 1/2 cups granulated sugar
• 1/2 cup sifted all-purpose flour
• 1/2 teaspoon salt
• 1 1/2 cups milk