I keep two cans of bacon grease in the fridge, when one is used up I use the second one and start refilling the empty. Nothing better for frying onions or making hash browns or potato pancakes.
I learned something from a gab post. You can buy a block of mild cheddar, brush lightly with vinegar, vacuum seal and in 3-4 months it will be a nice sharp aged cheddar. It works.