Brown the pork steaks in the butter. Pour off the excess fat. Season the steaks with salt and pepper. Combine the mustard and horseradish and spread over the steaks.
Combine the sauerkraut, apples, onion and caraway seeds and place in a two-quart baking dish. Arrange the steaks over the top, cover tightly, and bake for thirty minutes. Uncover and bake for thirty minutes longer.