1 lb. green beans
2 tbsp. cider vinegar
1/4 tsp. salt
1/4 tsp. black pepper
1 tsp. Dijon mustard
5 tbsp. vegetable oil
1/2 c. red onion, peeled and finely chopped

Boil 1 inch of lightly salted water in large sauce pan; add beans, cook covered for 10 minutes until crisp tender. Meanwhile, make dressing by combining remaining ingredients. Drain beans when done, toss immediately with dressing. Serves 4.