Green Beans With Sour Cream Sauce
["1 1/2 lb. green beans (fresh)", "1/2 c. chopped onion", "1 1/2 Tbsp. all-purpose flour", "1 1/2 tsp. vinegar", "dash of salt and pepper", "1/2 c. sliced water chestnuts", "boiling salted water (to cover beans)", "1 1/2 Tbsp. butter or margarine", "1/2 to 3/4 c. chicken broth", "1 1/2 tsp. dried dill weed", "1/2 c. sour cream", "2 tsp. minced parsley and slivered pimiento"]
["Wash, trim and French-cut diagonally, cut whole beans into inch lengths. Cook in boiling salted water for 5 to 7 minutes for French or 10 to 15 minutes for 2-inch pieces, until tender-crisp. Drain well."]
["green beans", "onion", "flour", "vinegar", "salt", "water chestnuts", "boiling salted water", "butter", "chicken broth", "dill weed", "sour cream", "parsley"]