Amarena cherries are a type of Italian sour cherry that is often used in desserts and cocktails. They are preserved in a syrup made from sugar and water, which gives them a shelf life of around two years. However, once opened, they should be consumed within four to six weeks.
When stored in the fridge, Amarena cherries will last for up to six months. The key to prolonging their shelf life is to make sure they are always covered in syrup. If the syrup starts to evaporate, simply add more sugar and water to replenish it.