The phrase "extra grease" usually means adding more oil or fat to something, like food, to make it greasier or oilier.
Sentences with «extra grease»
Cook bacon in a fry pan until crispy (not burned), lay on paper towel, blot extra grease off, cool and then crumble into small pieces. (thesugarcoatedcottage.com)
Carefully remove the hot meatballs from the pan onto a paper towel - lined plate to help soak up any extra grease from baking. (blessherheartyall.com)