Here is the (Mini 3hour refillable stove)





http://zenstoves.net/Canister.htm


It can be used mostly for warming purposes, not cooking.
Much like a sterno canister

The Sterno is actually much simpler and for picnics and short camping trips, a sterno seems more practical (Maybe evn putting 2 or 3 cans simultaneously for cooking) . But for travellers, there is no guarantee of finding Sternos everywhere I go.