Cooking oil is one of the most versatile tools in our kitchen. It comes in a variety of types, from olive oil to vegetable oil and even artisan varieties like coconut oil , and most of us use some form of oil every day for frying or roasting. But what do you do with the leftover oil in the pan after cooking? Sometimes, the amount of oil used is negligible, so you're not left with heaps in your pan and can simply wipe it away with a piece of kitchen towel. But when you've been frying an egg or