In a small bowl, combine the cracker crumbs, butter and sugar; blend well. Press onto the bottom and 1 in. up the sides of a greased 6-in. springform pan. Place on a baking sheet. Bake at 375° for 6-8 minutes or until lightly browned. Cool on a wire rack.
For filling, in a large bowl, beat lemonade concentrate and food coloring if desired for 30 seconds. Gradually blend in ice cream. Fold in whipped topping. Spoon into crust. Freeze until firm, about 2 hours.
Remove from freezer 10-15 minutes before serving. Carefully run a knife around edge of pan to loosen. Remove side of pan. Garnish with lemon zest if desired.
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