Key Lime Pie

I made this for a St. Patty's dinner we are having tonight with our friends. I haven't tasted the cooked product, but everything uncooked was tasty :)

4 large eggs, separated
1 (14 oz) can sweetened condensed milk
1/2 cup fresh lime juice
3/4 cup heavy cream
1 tsp grated lime zest
2 - 3 drops green food coloring (optional)
1 (9-inch) unbaked pie crust
1/2 tsp cream of tarter
1/2 cup sugar

Heat oven to 350. Beat egg yolks in medium bowl on low speed of electric mixer. Gradually beat in sweetened condensed milk and lime juice until smooth. Blend in cream, lime peel, and food coloring, if desired. Pour into unbaked pie crust. Bake 25 minutes. Remove from oven.

Beat egg whites and cream of tartar in a very clean bowl on high speed until soft peaks form. Gradually beat in sugar on medium speed. Beat 4 minutes or until sugar is dissolved and stiff glossy peaks form. Spread over hot pie, carefully sealing to edge of crust to prevent meringue from shrinking.

Bake an additional 15 minutes or until meringue is lightly browned. Cool 1 hour on wire rack. Chill at least 3 hours before serving.