How food is cooled and stored after cooking is as important for safety as how it's cooked. The 'danger zone' (4-60°C / 40-140°F) is the temperature range where pathogenic bacteria multiply most rapidly — doubling every 20 minutes under ideal conditions. Professional kitchens follow the 2-hour/4-hour rule: food that has been in the danger zone for less than 2 hours can be refrigerated; 2-4 hours it must be consumed immediately; over 4 hours it must be discarded. Rapid cooling is the key — a large pot of stock cooling on the counter can take 8+ hours to drop below 60°C, sitting in the danger zone the entire time.
Cool hot food rapidly: divide large batches into shallow containers (no more than 7cm deep) to increase surface area. Use an ice bath for liquids — place the pot in a sink of ice water and stir frequently. Stock and soups should cool from 60°C to 20°C within 2 hours, then refrigerate to get below 4°C within the next 4 hours. Never put a large hot container directly in the fridge — it raises the fridge temperature and risks warming everything else. Store cooked food in sealed containers. Consume refrigerated leftovers within 3-4 days. Frozen food is safe indefinitely but quality degrades — use within 2-3 months for best results.
The ice bath method is the professional standard: fill a sink or large container with ice and water, place the pot in it, stir the contents every few minutes. A 4-litre pot of stock drops from boiling to refrigerator temperature in 30-40 minutes this way versus 8+ hours on the counter. For rice safety: cook it, serve it, and get leftovers in the fridge within an hour. When reheating rice, ensure it's steaming hot throughout (above 74°C). Fried rice should always be made from properly cooled and refrigerated rice — not rice that's been sitting at room temperature.
Leaving a large pot of soup on the counter to cool overnight — this is the single most common dangerous cooling practice. Putting hot food directly in the fridge in a deep container — the centre stays warm for hours. Not cooling rice quickly — Bacillus cereus spores survive cooking and germinate rapidly in warm rice (leftover rice should be cooled within 1 hour and refrigerated immediately). Thawing at room temperature. Re-freezing thawed raw food — safe only if thawed in the refrigerator, not at room temperature.