Marinated yellow bean, celery and radish salad

1 lb. fresh yellow beans
1 small onion, sliced
1 cup oil
1/2 cup cider vinegar
1/4 cup wine or herb vinegar
1 tsp dry mustard
1 tablespoon dry basil
salt, pepper to taste
2 stalks celery, finely sliced
4 to 6 large radishes, sliced

Trim and steam yellow beans for 10 minutes, until they are tender but still very firm. Add onion to beans. Combine oil, vinegars and seasonings and pour over beans. Chill for several hours, stirring the beans at least once during the marinating process. Just before serving, combine beans with celery and radishes and serve on a bed of salad greens.