Bottega Pistho
An artisan jar behaves differently from an industrial one, and the reason is simple: with no preservatives, no heavy pasteurisation and much higher fruit or nut content, the product is more alive. It keeps for less time once opened — and for the same reason it tastes of more.
Before opening: the date is not an expiry
Spreads and jams almost always carry best before rather than use by. These are different things: the first marks the point up to which the producer guarantees the product's full qualities. Shortly past it, with the jar unopened, the contents are generally not dangerous, but they may have lost colour, aroma or texture.
Sealed and away from light, a jar is fine in a cupboard. The enemy is not time but heat: above 25 degrees, nut creams tend to separate and honeys change structure faster.
After opening, the rules genuinely change
This is where artisan and industrial part company. As a guide, always checking the label:
- Nut spreads — refrigerated, three to four weeks. Without palm oil the structure is less stable, and oil rising to the top is normal: just stir it back in.
- High-fruit jams and marmalades — refrigerated, two to three weeks. Less sugar means less preserving effect, so less time than a traditional preserve.
- Honeys — no refrigeration needed, and they keep for a very long time. Cold actually speeds up crystallisation, which is natural and not a fault.
- Pestos and savoury creams — refrigerated, covering the surface with a film of oil after each use. A week, not much more.
Mistakes that shorten a jar's life
- A wet or already-used spoon — the number one cause of mould. Water and crumbs introduce micro-organisms the product would not have on its own.
- Leaving the jar out between uses — nut spreads tolerate a few hours, jams far less.
- A badly closed lid — oxidation darkens the surface and dulls the aroma long before the product has actually spoiled.
- The shelf above the hob — convenient, and the hottest spot in the kitchen.
When to throw it away, no debate
Some signs leave no room for interpretation: mould on the surface, even a single spot; a sour, fermented or alcoholic smell in a sweet product; bubbles or foam in the jam; a domed lid, or one that hisses when opened; a sharp or fizzy taste.
In these cases you do not scrape off the top layer and eat the rest: in moist products the contamination reaches further than what you can see. The jar goes.
A change of colour, on the other hand, means nothing
A pistachio cream shifting from bright green to something duller, a citrus marmalade darkening at the edge, a honey setting solid: these are normal transformations. Pistachio chlorophyll oxidises in light, fruit sugars brown slowly, honey crystallises because it is a supersaturated solution.
These are cosmetic changes. If smell, texture and taste are right, the product is right.
A practical note on gifts
If you buy a gift box early for the holidays, keep it sealed somewhere cool and dry and do not open the jars to check. An unopened jar comfortably survives the months between purchase and giving: it is opening, not time, that starts the clock.
