Preheat oven to 350 degrees.

In a medium bowl, combine graham cracker crumbs, ground almonds, sugar and butter.  Mix well and press into bottom and sides of a 9 inch pie plate.  Bake for 8 to 10 minutes until lightly browned.  Cool completely.

In a medium bowl, combine sweetened condensed milk, sour cream, lime juice, and lime rind.  Mix well and pour into cooled graham cracker crust.

Bake in preheated oven (350 degrees) for 5 to 8 minutes.  Do not brown.  Chill pie thoroughly before serving.  Garnish with lime slices and whipped cream if desired.