1) their species. Summer and winter black truffles will last for up to ten days if stored correctly while white truffles should be consumed within five to seven days.
2) their age or maturity. Mature truffles have an exciting aroma, but immature truffles have little or no culinary value.
3) presence of larvae in them. The larvae of the truffle fly feed on the truffles.
4) storage methods used.
Truffle experts recommend proper storage methods to ensure the freshness of these mushrooms for at least two weeks after harvest. If proper storage conditions are met, they can remain fresh for many months.
There are a number of arguments about whether to clean or not to clean truffles before storage. Most culinary masters agree that truffles should not be cleaned until the day you are ready to cook or to use them. According to these culinary experts, truffles must be wrapped individually in paper towels to maintain their freshness. They also recommend the use of air tight containers for storage. These containers may be either glass jars with tight covers or Ziplock bags.
Truffles that will not be used in a couple or more days after harvest can be kept frozen for up to six months. Before placing them in the freezer, wrap them tightly in foil in small quantities and then place them in a closed container. You can also submerge them in olive oil prior to freezing. This will enhance the aroma of the truffles and generate truffle oil in the process.
Truffles can also be preserved by storing them in rice. Rice grains are able to maintain the natural moisture of truffles. They absorb the extra moisture truffles emit to avoid quick decay. After some time, these rice grains will be truffle-flavored and can then be cooked as a separate dish.
Do you need a step-by-step guideline for storing your truffles? Read this detailed infographic from Susan Alexander Truffles.