This tip is courtesy of Cook’s Illustrated:
Using a custard cup, make a basket with aluminum foil, like this:
Carefully pour the hot grease into the basket and let cool. Put it in the refrigerator to harden, wrap up the foil and either save it for one of those times when you need a little extra, or discard.
This batch will be discarded, but I did use some from a previous batch in the dish I was making as the drippings wanted to cook away before I was finished frying the meat in it.