Butter the bread, slice the cheese, and strain the kimchi - Generously butter one side of each slice of bread. Thinly slice the cheese. Drain as much liquid from the kimchi as possible to prevent a soggy sandwich.
Assemble the sandwich and grill - Spread the kimchi evenly on one piece of bread and cover with the other piece, so that the kimchi gets cozy with the cheese. Press down with a spatula and cook on moderately high heat until the bread is golden brown and well-toasted. Plate and Serve.
Notes
Sliced pickles or any variety of pickled or fermented veg can be subbed in lieu of the kimchi.