1 pkg. lemon Jello
1 3/4 c. hot water
1/4 c. lemon juice
1 lg. can evaporated milk, chilled
1 c. sugar
1 carton Cool Whip

Mix Jello and hot water. Add lemon juice, milk and sugar. Pour into graham cracker crust in 9"x12" pan. (24 crackers, 6 tablespoons butter and 2 tablespoons sugar.) Put Cool Whip on top and garnish with graham cracker crumbs.