How to keep a pot roast from burning? Your roaster needs to have a multi-ply base so that the heat is evenly distributed. You need a thick, stainless steel base of a 5-ply, 7-ply or 9-ply bottom, either one will work. The waterless cookware sets come with a multi-ply roaster that is already in the set. Start with browning the roast on both sides and then simmer for two hours on low heat. The simmering will create the juices to cook a flavorful and tender roast. The special vapor seal in the waterless cookware lids will lock in the juices and flavors. The secret is not to open the lid or the steam will escape. Leave the lid untouched for the whole two hours on the stovetop burner. The waterless roasters are made for the stovetop burners and not the oven. Watch the waterless cooking video below to show you how to cook a great pot roast without burning.