Corned Beef 4-6 lb. pickled corned beef 1 clove garlic 3 onion slices 1/2 teaspoon rosemary 1 bay leaf 1 stalk celery Cover meat with water and add remaining ingredients. Simmer for 4.5 hours until tender. Sauce: 2 tablespoons olive oil 1 tablespoon prepared mustard 3 tablespoons vinegar 5 tablespoons ketchup 1/2 cup brown sugar After roast boils, pour sauce over it and roast (covered) at 350 degrees for 30-45 minutes.