How do you dispose of rancid shortening?

To dispose of rancid shortening, allow it to solidify if it's liquid, and then place it in a sealed container or bag to prevent leaks. You can throw it in the trash, but check local regulations for any specific disposal guidelines. Alternatively, some areas may have composting or recycling programs that accept fats. Never pour it down the drain, as it can cause Plumbing issues.