Using a food processor, crush graham crackers into crumbs. Add sugar, nuts, zest and process until incorporated and nuts are chopped. Slowly add butter until all ingredients are moist. Press mixture into the bottom of a 10-12 inch cast iron skillet. Use bottom of a glass or metal measuring cup to help press crust. Freeze for at least 15 minutes.
Orange Dream Filling
In a small microwave safe bowl stir together gelatin and orange juice. Let stand until soft (about 5 mins) then microwave for about 20 sec. or until dissolved. Cool.
Roast nuts in single layer on cookie sheet for about 20 mins at 300oNote: Shake nuts half way through cooking time
In a large bowl beat whipping cream, confectioner's sugar, sour cream, 1 tbsp zest and extract on with with a mixer until fluffy. Drizzle gelatin mixture over top of cream, beat until combined. Spoon filling on top of prepared crust. Sprinkle roasted nuts and remaining zest on top of filling. Loosely cover then freeze at least 6 hours or overnight.
Let set for about 15 mins before serving. Garnish with orange slices and zest strips. Cut with a sharp knife dipped in hot water.