Carrots Au Gratin
["3 c. carrots, peeled and sliced", "4 Tbsp. butter", "1 large onion, sliced", "1/2 c. sharp Cheddar cheese, grated", "3 c. water", "1 tsp. salt", "1 c. bread crumbs", "4 Tbsp. flour", "2 tsp. butter"]
["Cook carrots and onion in boiling salted water for 15 minutes. Drain reserving 2 cups of cooking water.", "Melt 2 tablespoons butter.", "Blend in flour; gradually add cooking water, stirring until thick and smooth.", "Let boil for 2 minutes; remove from heat. Stir in cheese until melted.", "Arrange vegetables in casserole. Pour sauce over vegetables.", "Cover with bread crumbs.", "Dot with 2 tablespoons butter.", "Bake at 350\u00b0", "for 30 minutes."]
["carrots", "butter", "onion", "Cheddar cheese", "water", "salt", "bread crumbs", "flour", "butter"]