To maintain the freshness of leftover apricot cheesecake tartelettes, proper storage is key. After they have cooled completely, carefully place them in an airtight container to protect them from air exposure, which can lead to sogginess and spoilage. It is ideal to store the tartelettes in the refrigerator, where they can stay fresh for up to three days. If you anticipate having leftovers for more than a couple of days, consider freezing them instead. To freeze, place the cooled tartelettes in a single layer on a baking sheet and freeze until solid, then transfer them to a freezer-safe container or Ziplock bag, separating layers with parchment paper to prevent sticking. When you’re ready to enjoy them again, allow the frozen tartelettes to thaw in the refrigerator overnight or leave them at room temperature for about an hour. If you want to restore some of the crust’s crispness, you can reheat them in the oven at 180°C (350°F) for a few minutes before serving. Following these guidelines ensures that your delicious apricot cheesecake tartelettes remain as delightful as when they were first made!