1 Heat A Frying Pan To Medium High Heat. For Each Slice Of Bread, Butter One Side And Place Slice Butter Side Down On The Hot Pan. 2 Add A Layer Of Cheese To One Of The Slices. As The Bread Begins To Toast Just Slightly, And The Cheese Begins To Soften, Spread The Heated Sauerkraut Over The Slice Of Bread With Cheese. Using A Spatula, Flip The Cheese-Less Bread Slice Over On Top Of The Slice With Cheese And Sauerkraut. 3 After 30 Sec Or So, Check To See If The Cheese Is Just Beginning To Melt. If It Is, Flip The Whole Sandwich Over Onto The Other Side. Toast A Minute More Or Less On That Side Until The Cheese Has Melted, But Isn'T Runny. Remove The Sandwich From The Pan. Slice In Half.