Lemon Chiffon Cake

Ingredients

• 2 cups flour
• 1 1/2 cups sugar
• 1 tablespoon baking powder
• 1 teaspoon salt
• 3/4 cup water
• 7 egg yolks
• 1/2 cup vegetable oil
• Grated zest of 2 lemons
• 2 teaspoons vanilla
• 8 egg whites
• 1/2 teaspoon cream of tartar
• 1 1/2 cups confectioners’ sugar
• 2 tablespoons plus 1 teaspoon fresh lemon juice
• 2 tablespoons melted butter
• 1 teaspoon grated lemon zest