Tuna tartare is best enjoyed when it is freshly prepared. If you need to store it, make sure to do so properly. It will last for 2-3 days in an airtight container if stored in the fridge. To ensure optimum safety, make sure to consume it within 1-2 days of preparation.  When reheating tuna tartare, be sure to do so thoroughly and quickly to prevent bacteria growth. For optimal flavor and texture, consumption as soon as possible after preparation is recommended. Good food safety practices should be followed when handling and consuming tuna tartare. Make sure to wash your hands properly before and after preparing or eating the dish and clean all surfaces that have come into contact with raw ingredients such as fish.  Additionally, it is important to purchase fresh and of high quality for the best results. Do not consume if any signs of spoilage are present. If unsure, discard and do not risk consuming expired or contaminated products.