Cut lemon bar into 12 bite-size pieces. In small bowl, mix whipped topping, 1/2 teaspoon of the lemon peel and the lemon juice. In small serving glass, layer half of lemon bar pieces and half of whipped topping mixture. Repeat layers with remaining lemon bar pieces and whipped topping mixture. Garnish with remaining 1/4 teaspoon lemon peel. Serve immediately.