Good luck trying to warm up your soy burgers and chai latte’s over a candle when the power goes out ya morons.
You absolutely can cook and warm over candles millions of hardcore backpack trekkers do it all the time. I have cooked hotdogs,spaghetti, baked beans,spam,Hormel beef stew...drool after a long day of trekking Hormel beef stew hot from the mess kit is good eats. Their cornbeef hash in the tin with some carefully transported eggs is Bfast of champions on the trail.