It first starts with making bacon. I like to use the Kirkland 1.5lb bacon that is thick cut. This renders a decent amount of grease. After you enjoy breakfast and the oil is not scalding hot, get a bowl or large coffee cup and strain the grease with a paper towel until it is clean.
The next step is to line a cup with parchment paper and cool the grease in the fridge for about 30 minutes. Then slip the cup into the freezer for about 2 hours. If you forget to pull it from the freezer and you see it in the morning, just let it sit on the counter for 15 minutes before doing the next step. Remove the parchment paper and you should have a solid piece of clean pork lard.
Cut it up in pieces and store it in a Ziploc bag in the freezer. I just take a couple of pieces when coating my pans for cooking. I have also used it as a replacement for baking when I need shortening.