Ingredients

2/3 cup graham cracker crumbs2 tablespoons sugar3 tablespoons butter, meltedFILLING:1/2 cup sugar2 tablespoons all-purpose flour1 tablespoon plus 1-1/2 teaspoons cornstarch1/8 teaspoon salt1 cup water1 drop green food coloring, optional2 large egg yolks, room temperature, beaten2 tablespoons Key lime juice1 teaspoon butter1/2 teaspoon grated lime zestOptional: Whipped cream, thinly sliced Key limes and additional grated lime zest

Preparation

In a small bowl, combine cracker crumbs and sugar; stir in butter. Press onto the bottom and up the sides of a 7-in. pie plate coated with cooking spray. Bake at 325° for 8-10 minutes or until lightly browned. Cool on a wire rack.

In a small saucepan, combine the sugar, flour, cornstarch and salt; gradually stir in water and, if desired, food coloring. Cook and stir over medium heat until thickened. Remove from the heat. Stir a small amount of hot filling into egg yolks; return all to the pan, stirring constantly. Bring to a gentle boil; cook and stir 2 minutes longer. Remove from the heat. Gently stir in lime juice, butter and lime zest.

Pour into crust. Cool for 15 minutes. Refrigerate for 1-2 hours. If desired, garnish with whipped cream, lime slices and zest. Refrigerate leftovers.