There are many different opinions as there are cooks. The easiest and one of the tastiest ways I have found to cook a sirlion roast is in a crock pot. I add the roast to the pot after trimming fat. I then add about a 1/4 cup of water. To this I add a can of mushroom soup, and a package of onion soup mix. This gives added flavor and creates a gravy . You may also put in crock pot with only water for moisture. Cook for about 3-4 hours for about a 3 lb roast on high.