1 (6 oz.) can frozen lemonade
1 can Eagle Brand milk (sm. can)
1 (9 oz.) carton Cool Whip
1 lemon (optional for tartness)

Squeeze juice of lemon in Eagle Brand milk; mix well. Add frozen lemonade and mix. Fold in Cool Whip. Pour into graham cracker crust and freeze. Limeade and 1 lime may be substituted for lemon and lemonade.