Betsy's Savory Rice

Delicious with roast beef.

1 c. uncooked rice (not Minute Rice)
1 (4oz.) can mushrooms (stems and pieces) or an equal amount of fresh mushrooms
1 can onion soup
1 can water (sauteed in some of the butter)
1/4 lb. margarine or butter (cut in pieces)

Combine ingredients in a casserole and bake at 350 degrees for 1 hour. Stir when half done.