Cook beans in salted water 15 to 20 minutes or until tender. Drain thoroughly, place in a bowl, keep warm. Slice onions 1/8 inch thick, separate into rings and put into bowl with beans. Fry bacon until crisp. Pour off all but 3 T drippings. Add vinegar, sugar and salt to bacon in skillet, heat to boiling, stirring well. Pour this over beans and onions and toss slightly.
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