Triple-Layer Lemon Cake

1/2 recipe Lemon Curd (see Recipe Center) or 1 cup purchased lemon curd

1 cup buttermilk or sour milk

1/4 teaspoon salt

1 recipe Lemon Cream Cheese Frosting (see recipe below)

1/2 teaspoon baking soda

1 1/2 teaspoons baking powder

2 tablespoons lemon juice

2 teaspoons finely shredded lemon peel

1 cup butter , softened

21/3 cups all-purpose flour

Lemon peel curls

2 cups sugar