how to cook a tender london broil roast
1 Place the roast in a roasting pan, pour stewed tomatoes over it, and season with garlic salt. 2  Roast for 2 1/2 to 3 hours, until fork tender. 3  Let stand for about 10 minutes at room temperature before carving and serving. Preheat the oven to 350 degrees F (175 degrees C). 2  Place the roast in a roasting pan, pour stewed tomatoes over it, and season with garlic salt. 3  Roast for 2 1/2 to 3 hours, until fork tender.