Double-Decker Gelatin Salad

3 pounds 8 ounces. (1 3/4 quarts) strawberry or raspberry flavor gelatin
2 quarts boiling water
1 gallon cold water
1 cup lemon juice
6 pounds (1 gallon) California seedless grapes
2 quarts whipped topping
96 lettuce leaves, optional
96 small grape clusters (optional)

In a large bowl dissolve gelatin in boiling water. Add cold water and lemon juice; mix well. Reserve 2 quarts gelatin mixture.

Place 1 quart grapes in bottom of each of four 12 x 20 x 2-inch pans. Pour 1 quart gelatin mixture into each pan. Refrigerate 30 to 45 minutes or until gelatin begins to thicken.

Fold whipped topping into reserved gelatin mixture. Pour