Favorite, Easy Sunday Roast In A Crockpot

2-3 lb. rump roast
1 pkg. onion soup mix
2 cans cream of celery soup, undiluted
1 soup can full of water.
*Sometimes I add a can of mushrooms for texture

Trim fat off meat. Spray inside of crockpot with cooking spray. In a separate bowl, mix the soup mix, cream of celery and water. Pour over roast and cook on low for 8 hours. It makes its own gravy! Yummy! To thicken the gravy, take the roast out and mix a couple Tablespoons of white flour with COLD water, using a whisk (to keep the lumps out), in a separate bowl. Turn up the gravy to high on the crockpot and slowly whisk in the flour/water mixture. It will thicken immediately.