In A Large Mixing Bowl, Stir Together The Cheese And Sauerkraut. Add Enough Dressing To Coat, And Mix Thoroughly. Butter Each Slice Of Bread On One Side. Spread A Thick Layer Of The Cheese Mixture Onto Unbuttered Side Of Half Of The Bread Slices. Top With Sliced Tomato And Another Slice Of Bread. Heat A Large Skillet To Medium-High Heat. Fry Sandwiches On Both Sides Until The Outside Is Toasted And The Cheese Is Melted.