Actually I have two ....
I. Pencil Butane Torch ... ...
After years of spending 20-minutes plus, trying to light those silly propane heaters with a stick wedged between the casing to depress the pilot switch & endless burnt fingertips from matches or BBQ lighters .... usually with a mag-light between my teeth (and it always seems to be raining or windy when I need to light it) ... I can finally light the thing in under 10 seconds by myself one-handed.
II. 12v Crock Pot
No cooking smell in trailer, no wasted propane, no heating up the trailer during hot summer camping trips.....no wasting valuable vacation/camping time preparing meals .... just dump in the meal, plug it in & come back when it's time for dinner.