The first picture in my post is with the beef fat mixed in prior to the first coarse grind. All kidney fat. I coarse grind the fat first into box with a clear plastic trash bag in it. Twist the bad up tight, close the box and store it in the freezer till I need it. I pull it out and let it thaw a little while processing. When I’m ready to grind I use a big plastic scoop that I know almost exactly how many pounds of fat it will hold and I add that to the meat according to how many pounds of grind there is. Coarse grind once then fine grind once and then into the stuffer.