Food Safety and Sanitation
The temperature controls
Memorize the danger zone, 4 °C to 60 °C (40 °F to 140 °F), and the rules built on it: hold hot food at 60 °C or above, cold food at 4 °C or below, and apply the two-hour rule to food left in the zone. Cooling follows a two-stage rule: 60 °C down to 20 °C within 2 hours, then 20 °C down to 4 °C within a further 4 hours. Reheat to 74 °C (165 °F) within two hours, once only. Use shallow pans, ice baths, ice paddles and loose covers to speed cooling.
The hazards and the organisms
Biological hazards cause most illness. Know the profile of Salmonella (poultry, eggs), E. coli O157:H7 (ground beef, produce, water), Listeria (ready-to-eat deli meats, soft cheese; it grows at refrigeration temperatures), Staphylococcus aureus (hands, toxin is heat-stable), Clostridium botulinum (low-acid anaerobic environments, home canning, garlic in oil), Bacillus cereus (cooked rice held warm) and Campylobacter (poultry). FATTOM summarizes growth conditions: Food, Acidity, Time, Temperature, Oxygen, Moisture.
HACCP and allergens
HACCP has seven principles: hazard analysis, critical control points, critical limits, monitoring, corrective action, verification, record keeping. Allergen control is a documented program: priority allergens must be declared, and cross-contact prevented by dedicated tools, clean surfaces and handwashing. FIFO and date labelling support stock rotation.
Worked example: a 20 L stock cools on the counter for 3 hours. It fails. Decant into 5 cm shallow pans, ice bath to 20 °C within 2 hours, then refrigerate to 4 °C within 4 more.
Traps: freezing does not kill bacteria; the S. aureus toxin survives cooking; Listeria multiplies in the cooler; sanitizing does not replace cleaning.