1/2 c. (1 stick) butter
2 oz. unsweetened chocolate
1 oz. semi-sweet chocolate
1 tbsp. instant coffee
2 tbsp. sour cream
3 eggs
1 1/3 c. sugar
3 tbsp. light corn syrup
1 tsp. vanilla
9-inch unbaked pie shell, chilled

Preheat oven to 350 degrees.