1. Preheat Oven 350 degrees F:
2. Place the walnuts in a food processor and process to a crumbly consistency.
3. In a medium sized bowl place, the flour and cut in the butter, using two knives cutting through the flour in opposite directions.
4. Press into a 9-inch ungreased pie dish.
5. Bake about 12 – 15 minutes or until a light golden color – cool completely.
6. If the crust puffs, just poke with a fork and press down.

For the Filling:

1. In a medium sized bowl, mix the condensed milk, lime juice and lime zest and set aside.
2. In a large bowl place, the whipping cream, add 2 tbs. powdered sugar to the cream and whip with an electric mixer on high speed until stiff.
3. Fold the whipped cream into the lime mixture.
4. Pour over the crust and smooth.
5. Place in the refrigerator for at least two hours or in the freezer if made ahead. If placed in the freezer, take out and place in the refrigerator one hour before serving.