Cold weather is supposed to make packed lunches easy, and in one sense it does: keeping food cold stops being a problem in January. What replaces it is a set of smaller irritations that nobody warns you about, from split bottles to a sandwich so cold it has no flavour at all. Winter packing is its own small craft.
Freezing is a texture problem, not a safety one
Food left in a van or an unheated store overnight in frost does not become unsafe by freezing. It does become unpleasant. Yoghurt separates, salad leaves turn to slime as they thaw, tomatoes collapse, and boiled potatoes go grainy. If your lunch regularly freezes, choose foods that survive it or bring the bag indoors.
Bottles and the burst-in-the-bag problem
Water expands as it freezes, and a full plastic bottle in a cold van can split at the seam. You discover this when it thaws and the whole bag is wet. Leave a few centimetres of air in any bottle that might freeze, and keep drinks away from anything absorbent. A bag with a separate bottle pocket, of the type in the range at MEXS, keeps a leak from reaching the sandwiches.
Cold food tastes of less
Aroma compounds are far less volatile when cold, which is why a fridge-cold sandwich tastes flat. In winter this gets worse, and people conclude they have gone off packed lunches. The answer is more assertive seasoning: mustard, pickle, chilli, strong cheese, lemon, herbs added at the table. Season for the temperature the food will actually be eaten at.
The insulation works in both directions
An insulated bag slows heat moving in and heat moving out, which in winter means food from a warm kitchen stays lukewarm in the bag for hours. That is the same risky middle band as in summer. Chill the food properly overnight and pack it cold, even in December, rather than putting something warm in and trusting the frost outside.
What works when it is genuinely cold
Winter menus can be more substantial than summer ones, and the cold weather does most of the storage work.
- A vacuum flask of soup or stew, preheated with boiling water first
- Frittata, pork pie, cold sausages and other sturdy cold food
- Root vegetable salads with mustard dressing, which do not wilt
- Bread with a strong filling that does not depend on freshness
- A flask of tea, which does more for morale outdoors than any snack
Condensation when you come indoors
A cold bag brought into a heated room sweats, and the moisture ends up inside the lining. Left zipped shut in a warm cupboard, that damp bag develops a smell within a week and mould before the month is out. Empty it, wipe it out and leave it open to dry every evening in winter, which is when people are least inclined to bother.
Gloves change what is practical
Outdoor workers eat with cold hands and often with gloves half off. Small pots with fiddly lids, cutlery that needs two hands and food that must be assembled are all bad choices. Things you can hold in one hand, unwrap with your teeth if necessary and eat standing up are worth more in January than any recipe.