1 can (15 ounces) pitted sweet cherries
1 can (15-1/4 ounces) crushed pineapple
1 package (6 ounces) cherry flavored gelatin (or 2- 3 ounce packages)
1-1/2 cups cold water

Drain cherries and pineapple into a 2 cup measuring cup. Add water, if necessary, to equal 1-1/2 cups. Bring juice to a boil in a medium saucepan. Reduce heat to medium low and add gelatin. Stir until completely dissolved, about 2 minutes. Remove from heat and add cold water. Pour into an 8 x 12-inch pan. Gently stir in cherries and pineapple. Refrigerate to set, about 4 hours.