"Put on the fire" refers to the action of placing food or any object on a heat source to cook, boil, or warm it up. There are several synonyms for this expression, including "cook over the fire," "heat on the stove," "simmer on the hob," "boil in a pot," "roast over the coals," "grill on the barbecue," and "toast on the rack." Depending on the method and intensity of the heat, each of these synonyms has a distinct effect on the food being cooked. A seasoned cook may use these different variations to masterfully prepare a wide range of dishes with mouth-watering results.