Trim fat off roast. Peel and cut onion, carrots, and potatoes. Place roast and vegetables in crock pot and cover with liquids and spices. [If room, add more vegetables if desired]

Cook on low for 6-7 hours for 3 pound roast  or 7-8 hours for a 4 pound roast. 

Cut up roast and serve with vegetables and rolls. 

To make the gravy:

Save liquid from crock pot and place in a saucepan on the stove over medium high heat. Add 2 tablespoons flour and cook for 5 minutes or until sauce has thickened. Add salt to taste to gravy.