I have on 2 occasions tried cooking (using an Esbit stove and fuel) the contents of the little microwaveable Kraft macaroni and cheese cups by dumping the contents into a "Sierra" cup, then covering the top of the cup rather loosely with aluminum foil to help contain the heat. On both occasions, the mac and cheese took on a very unpleasant taste and smell, and I felt somewhat ill after consuming the food. Yes, it took me twice to figure out that something was wrong with this method <img src="/images/graemlins/blush.gif" alt="" /> <img src="/images/graemlins/blush.gif" alt="" />.