1 envelope unflavored gelatin
1/4 c. cold water
1/3 c. sugar or sugar substitute equivalent
1/3 c. lemon juice
2 (6 oz.) cartons fat-free lemon yogurt
1 tsp. grated lemon peel
1 (8 oz.) carton whipped topping (reduced fat)
1 graham cracker crust (8-inch; reduced fat)
lemon slices (optional)

In a microwave-safe bowl, sprinkle gelatin over cold water; let stand for 1 minute. Microwave on High for 20 seconds. Stir in sugar or substitute and lemon juice. Add yogurt and lemon peel; mix well. Fold in whipped topping; spoon into crust. Cover and refrigerate overnight. Garnish with lemon slices, if desired.

This is a great make-ahead; has a really tangy flavor.