This is an internet recipe I found. It is definitely a favorite. the roast beef is so flavorful cooked this way.
1 (3 to 4 lb) beef roast
1/2 c firmly packed brown sugar
1 pkg onion soup mix
1 onion , chopped (or handful dried onion)
1/2 tsp garlic powder
Salt and pepper to taste
Place roast in crock pot. Stir remaining ingredients together and pour over roast. Cook on LOW all night. The next morning stir together. Remove any membrane or fat, if desired. Stir well again. Let simmer on LOW until noon or evening. (The meat falls apart easily. It is not meant to slice like Arby's beef. So it doesn't compare with Arby's, it is just better.)
Serve on buns with Arby's sauce.
Arby's Sauce
1 c water
1/2 c ketchup
2 TB brown sugar
1/4 c white vinegar
3/4 tsp onion powder
3/4 tsp garlic powder
1/2 tsp paprika
3 TB Worcestershire sauce
1/8 tsp salt
1/8 tsp cayenne pepper
Corn Starch Mixture:
1 TB corn starch
2 TB water
Mix well set aside.
Whisk all ingredients, except corn starch mixture, together in a sauce pan. Heat On medium low. Simmer gently for twenty minutes, stirring several times. After twenty minutes add corn starch mixture, stir well. When sauce begins to thicken let it simmer on a very low temperature for ten minutes. Remove from heat and let cool. Store in covered container in fridge.