Crockpot Beef without stew

1 large onion , halved and sliced thin 8 ounces portabello mushrooms , sliced 2 tablespoons butter 1 tablespoon oil 1 tablespoon flour 3 garlic cloves ,[...]

1 beef roast 1 (16 ounce) can beer 1 (1 1/4 ounce) package dry onion soup mix 3 garlic cloves 1 (10 1/2 ounce) can cream of mushroom soup 10 cups water 1 lb[...]