Remove the roaster from the oven; add 3/4 cup water or broth to roaster, add the potatoes carrots, onions and mushrooms, sprinkle them with salt and pepper; cover and roast for another hour or until veggies are tender.
05Remove roast to platter and slice; surround with veggies, cover with foil and keep warm.
06Add cornstarch to cold water, whisk and add to roaster, whisk while bringing to boil, simmer for 5 minutes or until thickened; ladel over roast and veggies; serve and enjoy.