Put green beans, bacon grease, and garlic in a frying pan with about 1/4 cup water.

Cook at medium heat until green beans are fork tender. The water will evaporate a few minutes before the beans are done.

Add salt and pepper and remove from heat for 2 minutes

Add Parmesan and stir (this is literally the only time I ever use the powdered Parmesan although I'm sure fresh would work)