When deciding on a camp oven, you must consider how you will use it. Some camp ovens sit directly over the fire while others are designed to be used on a grill of some type. Some camp ovens use propane as a heat source. No matter the type you purchase, using a camp oven is simple and easy and is very similar to using your regular kitchen oven. Cast iron Dutch ovens can serve as a substitute for a portable camp oven for most recipes.