Freezing, Salting and Smoking

Three classic ways to hold food for months

6 minIntermediateUpdated 2026-10-23 Freezing, Salting and Smoking

You will learn

Freeze food so it keeps quality for months
Explain how salt preserves and use it for a simple cure
Tell hot smoking from cold smoking and know which is beginner-safe

⚠️ Thawed food must be treated as fresh: keep it cold and cook or refreeze only after cooking.

⚠️ Fish eaten without cooking should be frozen at −20 °C or colder for 7 days first to kill parasites.

⚠️ Cold smoking and dry-cured meats carry botulism and listeria risk. Follow tested NCHFP or USDA methods only.

Freezing: pausing time

Freezing at −18 °C stops microbial growth almost completely and slows enzymes to a crawl. It does not kill bacteria, so frozen food must be handled as fresh once thawed. Quality, not safety, is what limits freezer life: fat goes rancid slowly and ice crystals damage texture. Freeze fast, in small flat portions, so crystals stay small. Wrap tightly to exclude air, which causes freezer burn, those dry grey patches that are safe but tasteless. Label with contents and date. Rough quality limits: minced meat 3–4 months, whole cuts 6–12 months, fish 3–6 months, bread 3 months, blanched vegetables 8–12 months, cooked dishes 2–3 months.

💡 Freeze stock, purée and sauces in ice-cube trays, then bag the cubes.

Freezing vegetables and fruit

Most vegetables need blanching before freezing, just as for drying, or they lose colour, flavour and vitamins within weeks. Boil 2–3 minutes, cool in iced water, drain and pat dry, then spread on a tray to freeze loose before bagging. That way you can pour out a handful. Peppers, onions and herbs can be frozen raw. Fruit freezes well without blanching: hull, slice, tray-freeze, then bag. Soft fruit will be mushy when thawed but is perfect for cooking and smoothies. Do not freeze whole eggs in the shell, high-water salads such as lettuce and cucumber, or cream-based sauces, which split.

How salt preserves

Salt pulls water out of food and out of microbial cells by osmosis. At high enough concentration, the water that remains is bound and unusable for bacteria, so the food is stable. Portuguese bacalhau is the classic example: cod buried in salt for weeks, dried, then kept for a year or more. Salting is safest with fish and whole muscle cuts, done cold, in the fridge, with plenty of salt. It is not the same as curing sausages or hams, which involve nitrites and controlled humidity and can go dangerously wrong; leave those until you have learned from a tested source. Salt also helps ferments, which is the next node.

💡 Use plain non-iodised salt for preserving. Additives can discolour food and slow ferments.

A simple safe cure: gravlax-style fish

A beginner cure you can do in a fridge: take 500 g of very fresh salmon or trout fillet, skin on, from a source you trust; if it has not been previously frozen, freeze it at −20 °C for 7 days first to kill parasites, as the FDA advises for fish eaten without cooking. Mix 50 g salt and 50 g sugar, add black pepper and dill. Coat the fish, wrap tightly, weigh it down and refrigerate 36–48 hours, turning once. Rinse, pat dry, slice thinly. Eat within 3 days. This is a short cure, so it is a fridge food, not a shelf food. Whole salted cod requires far more salt and time and is best bought until you know the method well.

Smoking: hot and cold

Smoke adds flavour and its compounds slow spoilage on the surface, but smoke alone does not preserve. Hot smoking cooks the food, at 80–120 °C, in a covered barbecue or smoker with wood chips, until the inside reaches a safe temperature: 63 °C for fish and whole cuts, 74 °C for poultry. The result is a cooked food that keeps a few days in the fridge or freezes well. Cold smoking, below 30 °C for hours or days, does not cook and relies on a prior salt cure to be safe; done wrong it is a botulism and listeria risk. Start with hot smoking and follow NCHFP guidance before attempting anything cold.

💡 Hot smoking is cooking with flavour. Cold smoking is a preservation method with real risks; learn it from a tested source.