I read that if you want to clarify fat add slices of potato to the melted fat and fry them until the potatoes are brown. The potatoes are supposed to absorb unwanted flavors and collect some sediment.
This hint was listed in one of my Mother’s Greek recipes books. I have six, all published by various Greek Orthodox groups. This one is from the Sts. Constantine and Helen Ladies Society from the Fall of 1956. It was so well used the front cover is gone and the pages are tattered, so I don’t have the title of the book. My Mom has notes penciled in the margins. It’s a treasure.