Food served hot is held above 60°C / 140°F; below this threshold, the range of 5–60°C / 40–140°F is where bacteria multiply rapidly, and food must not remain there for more than 2 hours total. At home, the most practical way to hold food is to set the oven to 70–90°C / 160–195°F and keep the food in a covered container. If it will be too long before serving, do not hold the food hot; cool it quickly and store it.
The purpose of keeping food hot is not to cook it, but to hold it at a safe temperature. The measure is clear: every part of the food must remain above 60°C / 140°F. Below this temperature, especially between 5–60°C / 40–140°F, bacteria multiply rapidly; this range is called the danger zone, and cooked food must not remain in it for more than 2 hours total. The time is cumulative: half an hour on the counter is added to 1 hour at the table. That is why hot-holding time should be planned in advance.
The easiest way to do this at home is with an oven. Set the oven to 70–90°C / 160–195°F, and place the food inside in a covered container or covered with foil. This oven temperature does not cook the food, but keeps it above 60°C / 140°F. Do not open the oven door often. Stews hold well this way; fried foods and crispy items, however, are held uncovered on a wire rack at 90–100°C / 195–212°F, because steam in a covered container softens the crust. Stir the food occasionally while it is being held. Since the temperature drops each time the door is opened, check it infrequently.
A stovetop can also be used, but it requires care. A pot left over the lowest heat may scorch the food on the bottom; therefore, place the pot on a heat-resistant trivet or use a water bath: add hot water to a large pot and set the food container inside it. Thermoses and food jars also keep food hot; preheating one by filling it with boiling water for a while makes it work much longer. With all these methods, check the temperature occasionally with a thermometer. In a water bath, the water does not need to boil; gentle steaming is enough.
There is a limit to how long food should be kept hot. Food held for a long time dries out, loses color, vegetables fall apart, and meat becomes tough; instead of holding it for more than 2 hours, it is better to cool and store the food quickly, then reheat it shortly before serving. When reheating, bring the thickest point to 74°C / 165°F. Food intended for hot holding should be put away while hot; do not put lukewarm food in the oven and try to hold it hot—reheat it first. This choice also helps preserve food quality at large gatherings.
A few precautions at the table help, too. Preheating serving plates and bowls helps food cool more slowly on the plate. Bring all the dishes to the table at once so they do not wait one by one. At large gatherings, keep food hot in portions rather than in one large container; each time the large container is opened, it cools and reaches the danger zone more quickly. After the meal, refrigerate leftovers within 2 hours at the latest, and do not leave them out to be kept warm again.
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