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There are many options like a campfire, a charcoal grill, outdoor propane grill. However, I have been eating a variety of food that requires a butane stove. In Nepal, when I was up in elevation at base camp, we used butane stoves to cook soups and hot pots. If you go to some Asian family dinners, they use butane stoves for hot pots, shabu, sukiyaki, and other family style cooking.
No electricity is required, just a butane canister to put into the stove and turn on the electric igniter with the fuel open, and the heat is on. My favorite brand is Iwatani, as they have been making stoves for over 90 years, and they really don’t fail. It is a good way to heat up a can of soup or chili, or even boil water to pour into your camping food pouch. When I was in a situation with no power before dinner, this is what I used to make dinner for the night. Get one for your kitchen and use it for shabu or hot pot nights. When you do lose power, you can always use this.
This one is 15,000 BTU of heat, and it comes with a carrying case. You can also buy accessories for this for different types of cooking. Make sure you get some Iwatani Butane Fuel to have on hand.
Iwatani Butane Cooktop Stove (AFFILIATE LINK)