• Butter the crockpot insert
• Slice the kielbasa into chunks the size to fit your bread if you intend to make sandwiches
• Place the sliced sausage into the bottom of the crockpot
• Layer the sliced onion on top the sausage
• Sprinkle on the brown sugar or drizzle on the honey if you are using it
• Pour the sauerkraut over the top with the juices
• Cover and cook on low for 5 to 8 hours

If you're making Sandwiches

• Lightly butter the rye bread and toast for 2 to 3 minutes
• Lay a slice of swiss cheese on each piece of bread and toast until melted
• Arrange slices of kielbasa and drained sauerkraut on the toasted bread to your preference