1/2 c. cider vinegar
1/4 c. water
2 tsp. dry mustard
1/2 tsp. salt
1/3 c. sugar
1/2 tsp. celery seed
2 c. sliced, cooked beets
1 medium onion, sliced

Heat the vinegar & water to boiling. Add the mustard, salt & sugar. Blend until mixed and let boil again. Then pour over the combined celery seed, beets & onion. Cover and place in the refrigerator to marinate overnight or longer. Serve cold.