If you could only have one cooking tool/appliance that is not propane fueled and is not a microwave, what would it be? What is the most versatile all-around thing to cook/heat a wide variety of foods with the least amount of electricity or other fuel? Single burner butane camp stove? Something like a JetBoil? The RoadPro lunchbox oven? The small lunch-size crock pot? In my research I've discovered there is a myriad of options. I'm looking for recommendations from actual people with experience that aren't Amazon reviewers.