Refrigerate graham cracker crust until well chilled.
Preheat oven to 350 degrees F. In a medium bowl, combine condensed milk, key lime zest, and key lime juice. Add egg yolks and egg; stir until well blended. Pour into chilled graham cracker crust.
In a medium bowl, beat egg whites until stiff peaks form; gradually fold in sugar. Spread meringue over key lime mixture, being careful to spread to edge of pastry to prevent shrinkage during baking. Check out my hints and tips on making a Perfect Meringue.
Bake 20 minutes or until meringue is golden brown. Remove from oven and cool completely on a wire rack.
Makes 6 servings.
Florida Key Lime Pie Recipe: https://whatscookingamerica.net/keylimepie.htm