I make this hearty stovetop favorite at least twice a month- my husband, Jim, loves it! You can use whatever vegetables are abundant in your garden. I like to cut up the leftovers, add gravy and warm it up like a stew.
Cut slits in roast; insert garlic slices. In a Dutch oven, brown roast in oil on all sides. Remove roast; add the onion, celery and turnips to skillet. Place roast over vegetables; add water and bouillon. Bring to a boil. Reduce heat; cover and simmer for 2 hours.
Add the potatoes, carrots and beans; cover and cook for 45 minutes. Add mushrooms; cover and cook 15 minutes longer or until meat and vegetables are tender. Remove to a serving platter and keep warm.
Skim fat from cooking juices. Combine cornstarch and cold water until smooth; stir into pan. Bring to a boil; cook and stir for 2 minutes or until thickened. Serve with roast and vegetables.