If pre sliced good to go, otherwise slice thin about 1/4”, a little salt on each side, heat some butter or ghee, fry each side about 1 or 2 min, or until the blood stops, whichever comes first. Biggest mistake is to overcook, it makes it tougher. Rare to medium rare it should be as tender as filet mignon.

It’s an acquired taste if you didn’t grow up eating it. Heart is much milder if you need training wheels, and has good stuff like Coq10. Kidney is next level as far as strong flavor, and spleen is definitely not for the faint of heart!