We think Impossible™ Burger tastes best when served hot, immediately after being cooked-- digging in is the best part of cooking, after all. That said, you can feel comfortable storing and reheating it in the way you would other leftovers that contain ground beef, as Impossible Burger poses no unique food safety concerns.
For freshness, we recommend that you finish eating the entire package within three days of opening it, or ten days after it was thawed-- whichever comes first. You should also abide by any "Best By" sticker or "If Frozen Use Before" date on the packaging. (This will vary depending on where you bought it and whether it was thawed or frozen on the store’s shelves.)
Keep in mind that the length of time any leftovers (not just our products) are safe to eat is largely dependent on how they were handled before, during, and after cooking, so we encourage you to use your best judgement based on the way the leftovers look and smell.
Questions about how to store Impossible Burger before you cook it? Click here.