In a large bowl, mix together the pork, onion, salt, pepper, egg & rice. Roll into balls a little larger than golf ball size. In a greased casserole dish, place a layer of sauerkraut. put a layer of pork balls on top. then cover with sauerkraut. Cover and bake at 350° for 1 to 1-1/2 hours.
We usually serve this with mashed potatoes