1.In A Large Bowl, Combine The Pork, Onion, Rice, Egg, Salt And Ground Black Pepper. Mix Well And Form Into 2 Inch Balls. 2.For Stove: Place One Jar Of The Sauerkraut In A Large Pot Over Medium Low Heat. Then Add The Pork Balls And Cover With The Other Jar Of Sauerkraut. Simmer Over Medium Low Heat For 1 To 1 1/2 Hours. 3.For Slow Cooker: Place One Jar Of Sauerkraut In The Bottom Of The Slow Cooker. Add The Pork Balls And Top With The Other Jar Of Sauerkraut. Cook On Low Setting For 8 To 10 Hours