Pineapple-Shrimp Mold

8 oz. pkg. lime Jello
1 1/2 c. pineapple chunks
2 c. boiling water
1/2 c. mayonnaise
2 c. cold water
1 T. grated onion
1 T. vinegar
1 or 2 cans shrimp, ringed and drain
1 tsp. salt

Dissolve Jello in boiling water. Add cold water, vinegar and salt. To 1 1/2 c. gelatin mix, add pineapple chunks. Pour into 2 quart salad mold. Let set. To 1 cup gelatin mix, add mayonnaise and onion. stir well. Pour over set mixture of above. Chill. then set, pour over the rest of gelatin mix to which shrimp have been added. Let set. Unmold on lettuce to serve. Serves 8.