Kitchen Hygiene and Safety
FoundationKitchen hygiene and safety come first when cooking: personal hygiene, separating raw and cooked food, correct use of tools, knowing why food spoils and how to prevent it, plus apron care and organised work habits keep food poisoning away.
- Kitchen hygiene and safety come first in food preparation — prevention beats cure
- Personal hygiene: wash hands, trim nails, tie hair, cover wounds, and never cook while ill
- Keep raw and cooked food apart to prevent cross contamination
文體小知識：生活科技說明文：以原則、步驟和實例說明廚房衞生與安全的做法，重點在預防勝於補救。
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1The kitchen is where hygiene matters most at home. Food is rich in nutrients and moisture, and Hong Kong's warm, humid weather lets bacteria multiply fast; poor personal hygiene and mixed raw-cooked handling easily end in food poisoning. Before learning to cook, learn the rules of hygiene and safety first.
2Personal hygiene is the first line of defence: wash hands, trim nails, tie hair, wear clean clothes, cover wounds, and stay out of the kitchen when ill. Protective clothing matters too — the apron covers the front and blocks grease; wash it often and take it off when you leave, so contamination does not travel.
3Food spoils mainly through bacteria and moulds, which multiply fastest in the danger zone between about 4°C and 60°C. Prevention controls temperature and moisture: chilling and freezing slow growth, thorough heating kills bacteria, dryness and avoiding cross contamination help, and dates on labels must be checked.
4Good work habits tie hygiene and safety together: gather everything and read the recipe before starting, work in the order prepare, cook and serve, clean as you go, and tidy up at once after finishing. Once these become second nature, cooking is faster, safer and the food can be trusted.
1Summary 重點摘要
Kitchen hygiene and safety come first when cooking: personal hygiene, separating raw and cooked food, correct use of tools, knowing why food spoils and how to prevent it, plus apron care and organised work habits keep food poisoning away.
2Vocabulary cards Vocabulary
The transfer of bacteria from raw food to ready-to-eat food via tools or hands.
Habits such as hand washing, trimmed nails, tied hair and clean clothes that keep the body clean.
A protective garment covering the front of the body to keep grease off clothes; wash it often.
Food changing colour, smell or texture through microbes, oxidation or enzymes.
Microbes too small to see; they multiply fast in warm, damp places and cause food poisoning.
The range from about 4°C to 60°C in which bacteria multiply fastest.
The board for cutting food; use separate boards for raw meat and cooked food.
Storing food below 4°C to slow the growth of bacteria.
Illness from eating contaminated or spoiled food, often with vomiting and diarrhoea.
Ordering tasks as prepare, cook and serve so work is systematic and time-saving.
3Step by step Steps
- Why hygiene mattersThe kitchen is where bacteria grow most easily at home: food is rich in nutrients and moisture, and Hong Kong's warm, humid weather speeds up their spread. Careless food handling wastes money when food spoils, and at worst causes food poisoning with vomiting and diarrhoea, sometimes needing hospital care. For example, a box of roast pork left at room temperature for over two hours in summer may already hold large numbers of bacteria, and eating it brings illness within hours. Good hygiene and safety habits are the first lesson before any cooking.
- Personal hygiene rulesPersonal hygiene before cooking is clear-cut: wash hands thoroughly with soap and water, keep nails short and clean, tie back hair so none falls into food, and wear clean clothes; cover any wound with a waterproof plaster and gloves, and avoid handling food when ill. For example, opening the fridge for a drink after cutting raw chicken without washing hands passes bacteria onto the fridge handle and other food — this is cross contamination. The correct habit is to wash hands again before every change of task in the kitchen.
- Protective clothingThe apron is the most important piece of protective clothing in the kitchen. A good design covers the front of the body and resists water and grease, blocking spills from your clothes while stopping dust from your clothes falling into food. Aprons need regular washing and must be changed as soon as they get dirty, and taken off when leaving the kitchen. For example, if an apron stained by tomato soup is worn on to handle other food, bacteria on the stain may transfer across; the right habit is to change into a clean apron before continuing work.
- Using tools correctlyCorrect use of tools and equipment is the key to safety: hold the knife firmly and steady the board, curl your fingers around the food while cutting, and keep separate boards and knives for raw meat and cooked food to avoid cross contamination; turn pot handles inwards so hot soup cannot be knocked over; wash, dry and put away equipment at once after use. For example, cutting watermelon on a board that has just held raw pork passes salmonella onto the fruit; keeping two boards in different colours — red for raw meat, green for ready-to-eat food — makes the rule easy to see.
- Why food spoilsFood spoilage is caused mainly by microbes: bacteria and moulds multiply quickly in warm, moist, nutrient-rich surroundings, breaking food down and producing off-smells and toxins; oxidation and enzymes also discolour food and change its flavour. Bacteria multiply fastest between about 4°C and 60°C — the danger zone. For example, bread left on a damp summer table grows mould spots within two or three days as mould spores settle and multiply; the same loaf in the fridge or freezer keeps far longer because low temperature slows microbial activity.
- Preventing spoilageEating spoiled food causes food poisoning that damages health and schoolwork. Prevention targets the conditions microbes need: low-temperature storage (chilled below about 4°C or frozen below minus 18°C), heating food right through to the centre, keeping things dry, sealing out air and avoiding contamination. For example, leftovers should be chilled within two hours, reheated thoroughly just once, and never reheated a second time; food that smells off, changes colour or feels slimy should be thrown away whole, even if only part looks spoiled — never gamble on it.
- Work habits and orderSystematic work habits make cooking faster and safer: read the recipe first and gather all ingredients and equipment; order the tasks as prepare, then cook, then serve; clean as you go and keep the bench clear; wash up, wipe down and clear the rubbish immediately after finishing. For example, when making pizza, measure and lay out every topping first and preheat the oven, washing dishes in the gaps while the dough proves; hunting for ingredients mid-task leaves you flustered, and hands that touched packaging and phones carry bacteria straight into the food.
4Diagrams Diagrams
5Worked example Example
Example: homework asks you to find ten hazards in a photo of a home kitchen and suggest an improvement for each.
- Hygiene: raw and cooked boards and knives stacked together; a blackened cloth by the stove — separate them and replace the cloth
- Storage: fridge door ajar; fresh milk standing on the room-temperature bench — close the fridge and chill the milk
- Safety: frying pan handle jutting out; paper towels stacked by the flame — turn the handle in and clear the clutter
- Floor: water near the sink causing slips — wipe it dry at once and lay a non-slip mat
- Habits: no soap by the sink; knives unwashed — stock the soap and return washed knives to the rack
- Answer: The ten hazards fall into five groups: hygiene (raw and cooked mixed, dirty cloth), storage (fridge ajar, milk at room temperature), safety (exposed handles, flammables near flame), environment (wet floor) and habits (no washing facilities, tools left out). Scan the kitchen in the order personal hygiene, equipment, storage temperature and environment, matching one improvement to each hazard — nothing gets missed and the answers do not all crowd into one category.
6Common mistakes Mistakes
7Quick check Quick check
Q1Which practice is correct? A. eating bread after cutting raw meat without washing hands B. using separate boards for raw and cooked food C. using the cloth until it turns black
Q2What is the danger zone, and why should food not stay in it for long?
Q3How should fresh milk, bread and canned food each be stored?
Q4Why should an apron be waterproof and easy to wash?
Q5Name three personal hygiene requirements before cooking.
8Recap Recap
- Kitchen hygiene and safety come first in food preparation — prevention beats cure
- Personal hygiene: wash hands, trim nails, tie hair, cover wounds, and never cook while ill
- Keep raw and cooked food apart to prevent cross contamination
- The danger zone is about 4°C to 60°C; food should not linger there
- The apron protects clothes and food alike — wash it often; organised work habits make cooking faster and safer