1 1/4 c. crushed graham crackers
1/3 c. melted butter

OR FOR CRUST:

Buy a ready made graham cracker crust (that's what I do)

FOR PIE:

1 can sweetened condensed milk
4 eggs, room temperature
1/2 c. key lime juice
6 tbsp. sugar
1/2 tsp. cream of tartar

CRUST: Mix together and press into pie pan; can be kept in freezer until ready to fill.

PIE FILLING: Beat 1 egg white stiff and fold into mixture of condensed milk, 4 egg yolks and key lime juice. Pour this entire mixture into bottom of pie plate.

PIE TOPPING: In another bowl, beat 3 remaining egg whites and gradually add 6 tablespoons sugar and 1/2 teaspoon cream of tartar. Spread this meringue over the filling. Bake at 350 degrees for 10-15 minutes or until golden brown.