Rinse Liver And Pat Dry. Heat Oil In A Large Non-Stick Skillet Over Medium Heat. Place The Fresh Thyme In A Layer On The Bottom Of The Pan, Then Lay The Liver On Top. Cook On Medium Heat For About 4 To 5 Minutes On Each Side. Calves' Liver May Be Eaten Slightly Pink, But Be Careful Not To Overcook It. Season With Salt And Pepper After Cooking.