
Boil the water then pour the gelatin into it. Stir until dissolved.
Pour the gelatin into a large bowl and stir in the yogurt.
Stir in the lime juice and zest and finally the whipped topping.
Pour into a graham cracker crust and smooth out the top.
Refrigerate until set.
Garnish with additional whipped topping and lime slices or curls, if desired.