Ingredients

  • 1 lemon poppyseed cake mix
  • 34 cup sugar
  • 3 tablespoons cornstarch
  • 14 teaspoon salt
  • 34 cup water
  • 1 tablespoon butter
  • 13 cup lemon juice
  • 34 cup sugar
  • 14 teaspoon cream of tartar
  • 1 teaspoon vanilla
  • 3 egg whites
  • 14 cup boiling water

Method

  • Bake cake as directed on package in 9x13.
  • Cool.
  • For Filling: Mix sugar, cornstarch and salt in a small saucepan over medium heat.
  • Add water slowly stirring constantly.
  • Bring mixture to a boil and boil for 1 minute, remove from heat.
  • Stir in butter and lemon juice.
  • Mixture will thicken as it sits.
  • For Frosting: Mix sugar, cream of tartar, vanilla and egg whites in a bowl add boiling water and beat at high speed for 5-7 minutes until fluffy.
  • When cake and filling are cooled top the cake with the filling then frost.
  • * Looks pretty in a glass cake pan*.