Yes, you can reuse ghee that was used for deep-frying or sautéing, but only if it hasn't been overheated or contaminated. Signs that ghee is no longer good include a dark color, a rancid smell, or the presence of food particles.
Ghee, being clarified butter, has a high smoke point, making it suitable for reuse in cooking. However, the number of times you can reuse it depends on several factors:
How it was used: Ghee used for deep-frying can generally be reused fewer times than ghee used for sautéing because deep-frying involves higher temperatures and more food particles.
Temperature: If the ghee was overheated (smoked or burned), it degrades more quickly and should not be reused.
Contamination: Food particles left in the ghee can burn and cause it to spoil faster. Always strain the ghee after each use.
To reuse ghee safely:
Strain it: After each use, let the ghee cool slightly, then strain it through a fine-mesh sieve lined with cheesecloth to remove any food particles.
Store it properly: Store the strained ghee in an airtight container in a cool, dark place. It doesn't necessarily need refrigeration, but refrigeration can extend its shelf life.
Check for signs of spoilage: Before reusing, check the ghee for any signs of degradation, such as a dark color, a rancid smell, or a thick, sticky texture.
If the ghee shows any of these signs, discard it. It's generally safe to reuse ghee 2-3 times if it's been properly strained and stored and hasn't been overheated.
To extend the life of your ghee, avoid frying foods with heavy coatings or batters, as these tend to leave more residue in the ghee. Also, consider dedicating a batch of ghee specifically for sweeter applications to avoid flavor transfer.