How to cook kielbasa and sauerkraut?

Autumn's Mommy

New member
I have the pre-cooked kielbasa and two bags of sauerkraut. I was told to boil the kielbasa for 20 mins then put everything in the slow-cooker overnight. But what I don't understand is, if the kielbasa is already cooked, why do I need to boil it?? Will I overcook it? Someone help me out here please!
 
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