In a large bowl, combine the pork, onion, rice, egg, salt and ground black
pepper. Mix well and form into 2-inch balls.
For stove: Place half of sauerkraut in a large pot over medium low heat. Then
add the pork balls and cover with the other half. Simmer over medium low heat
for 1 to 11/2 hours.
For slow cooker: Place half of sauerkraut in the bottom of the slow cooker. Add
the pork balls and top with the other half. Cook on low setting for 8 to 10
hours.