1 can sliced beets
1 (3 oz.) pkg. lemon-flavored gelatin
3 tbsp. vinegar
1/2 tsp. salt
3/4 c. diced celery
2 tbsp. prepared horseradish
1 tbsp. minced onion

Drain beets, reserving liquid. Dice beets, set aside. Add water to beet liquid to make 1 1/2 cup, heat to boil. Add gelatin, stir until dissolved. Add vinegar and salt. Chill until partially set. Stir in beets, celery, horseradish and onion. Pour into 10x6x2 inch baking dish. Chill until set. Serve on lettuce and top with mayonnaise.