Garden gluts: brining, salt and keeping

Fermenting or vinegar: which published method suits a glut?

The choice turns on what has been documented for that particular vegetable, not on which method is thought to taste better. A working garden produces uneven quantities: a few kilos of cucumbers in one week, a row of green beans the next, a bucket of green tomatoes at the end of the season. Each of those has a different documentary history.

For cucumbers, cabbage, green beans, beetroot, peppers, carrots, asparagus, cauliflower, green tomatoes, pearl onions and refrigerated kimchi, recipes by vegetable are set out in the manual at brining and fermenting vegetables, which states plainly when nothing is published for a given crop. That last point matters more than it first appears. A gardener with a surplus of a vegetable that has no published brining procedure is not being offered a method at all, only a guess, and a guess is a poor thing to put in a jar.

Fermentation in brine suits a glut that can be held for weeks and used gradually: cabbage for sauerkraut, cucumbers for sour dill pickles, carrots and cauliflower for mixed jars. Vinegar pickling suits a glut that needs to be dealt with in a single afternoon and stored on a shelf, and it suits vegetables whose published fermentation record is thin. The two methods are not rivals. They answer different questions about time, storage and how much of the crop can be processed at once.

A practical division for a garden holding is this: ferment what has a documented salt-and-water procedure and a sensible vessel to sit in; pickle in vinegar what must be sealed and forgotten; and dry, freeze or give away the rest. The decision is made per vegetable, and it is made from the record rather than from habit.

How much salt does a brine actually need?

Salt in a brine is measured as a proportion of the water, not as a handful thrown into a crock. Published procedures give the figure as a percentage by weight, and the figure differs between vegetables and between methods. A brine described as 5 per cent salt means 50 g of salt dissolved in 1 litre of water, since a litre of water weighs approximately 1 kg. A 2 per cent brine means 20 g per litre. The arithmetic is simple, but it only works if the salt is weighed rather than poured.

The salt itself should be pure and free of additives. Iodised salt and salt with anti-caking agents are avoided in most published fermentation instructions because they can affect the brine and the colour of the vegetables. Sea salt, pickling salt and kosher salt are the usual choices, provided they contain nothing else.

Water matters too. Chlorinated tap water is commonly left to stand or is replaced with bottled or filtered water in published recipes, since chlorine can inhibit the bacteria that do the work. The vessel matters as much as the brine: a crock, a food-grade bucket or a large jar, with the vegetables kept below the surface of the liquid. A weight, a clean stone or a sealed bag of brine is used to hold them down, and a cloth or lid keeps dust and insects out.

Strength is not the only variable. Temperature and time are stated alongside it, because a brine at a given percentage behaves differently in a warm kitchen and a cold cellar. Published procedures give both, and a gardener following them should record what was done: the date, the weight of salt, the volume of water, the temperature of the room. Without that record, a successful jar cannot be repeated and a failed one cannot be explained.

How long does a jar of brined vegetables keep?

Keeping time depends on the method, the acidity reached, and where the jar is stored. Fermented vegetables in brine are living things: they continue to develop in the jar, and their keeping quality is bound up with the acidity they have produced. Once the fermentation has reached the point described in the source, the jar is moved to a cooler place, and the contents are eaten over the following weeks and months. Refrigeration slows the process further.

Vinegar-pickled vegetables keep by a different mechanism. The acidity of the vinegar, usually diluted to a stated strength, is what preserves them, and a sealed jar stored in a cool, dark place will hold for a long period. Once opened, the jar goes into the refrigerator and is used within a reasonable time.

Safety is not a matter of smell alone. Published guidance deals with acidity, spoilage and the produce that should be discarded rather than eaten, and it sets out a harvest calendar for the vegetables concerned. A jar that is soft, slimy, mouldy on the surface, or that smells wrong is discarded. A jar that has been kept below the brine line, at the stated strength, and at the stated temperature is the one that can be trusted.

The gardener's advantage is that the crop is known: the variety, the day it was picked, the condition it was in. That knowledge is worth writing on the jar label alongside the date and the brine strength. A store cupboard of labelled jars, each traceable to a procedure and a picking, is the practical end of a glut.

What the record does not cover

Not every vegetable in a garden has a published brining procedure, and the honest answer for those is that no method is being offered. Where a source states that nothing is published for a crop, the gardener is left with the alternatives: vinegar pickling, drying, freezing, or simply eating and sharing the surplus while it is fresh. This is not a gap to be filled by improvisation. A jar of vegetables preserved by an untested method is a risk taken for the sake of using up a row.

The same discipline applies to quantities. A recipe written for a small batch does not scale indefinitely by doubling the salt and hoping. Published procedures give proportions, and proportions hold at any size, but the vessel, the surface area and the temperature of the room do not scale in the same way. A large crock in a warm room behaves differently from a small jar in a cool one.

Keeping the kitchen side in order

The kitchen side of a growing plot is a matter of records as much as of recipes. A notebook with the date, the vegetable, the method, the brine strength and the storage place turns a one-off success into something that can be repeated next season. It also makes the failures legible: a batch that spoiled can be compared with one that kept, and the difference found.

For the gardener with more vegetables than can be eaten, the useful sequence is to check what is published for the crop, follow the stated proportions of salt and water, keep the vegetables under the brine, store the jars cool, and label everything. Where nothing is published, choose a method that is documented for another crop or preserve the surplus by other means. The glut is a seasonal problem with a documentary answer, and the answer is better followed than invented.

Preserving a glut and setting a spring table are both forms of keeping, though the second is measured in days rather than months. Where brine and salt extend the life of vegetables, the arrangements described on the spring table concern the short season of tulips, the setting of a tea table, the distinction between handmade painted objects and copies, and the care owed to enamelled and lacquered pieces. The two pages meet at the same practical question: what a household does with what the garden gives, and how the record of that work is kept.