Cranberry Fruit Salad

1 can (8 ounce) crushed pineapple, packed in juice. Drain and reserve juice.
1 package (small) raspberry jell-o
1 can whole berry cranberry sauce
1/2 cup chopped celery
1/2 cup water
1/2 cup chopped walnuts (optional)
2 tablespoons lemon juice

Pour pineapple in a bowl. In a saucepan, mix together reserved pineapple juice, water, and lemon juice. Bring to a boil. Remove from heat and add jell-o. Stir until jell-o has dissolved. Break up cranberry sauce with a fork and stir into jell-o mixture. Refrigerate until mixture begins to set. Stir in pineapple, celery and walnuts. Mold. Chill until firm.