Dutch ovens you want to use with charcoal usually. You can use open fire coals, but it is going to take a lot of work and it isn't easy. You should be able to find online of people showing it. You set aside an area, and put coals below and on the lid, rotate lid and pot every now and then to cook evenly. I've done cobblers, rice and even bread in a dutch oven, can do a lot. Big pot use tripod over fire. If you have a stove big enough, can use that.