1 (8 1/2 oz.) can lima beans
1 (8 oz.) can green beans
1 (8 oz.) can red kidney beans
1 med. sweet onion (preferably red), sliced and separated into rings
1/2 c. chopped pepper
2/3 c. vinegar
1/2 c. salad oil
1/4 c. sugar
1 tsp. celery seed

Mix last 4 ingredients. Pour into screw top jar. Shake well and pour over drained vegetables. Chill 8 hours before serving.