Step 1

In a large skillet over medium heat melt butter and bacon drippings until foaming subsides, about 2-3 minutes. Add onions and cook, stirring occasionally, until onions are translucent and edges begin to brown, about 8-10 minutes.

Step 2

While onions cook rinse and drain sauerkraut at least twice. Make sure sauerkraut is well drained and add it to slow cooker along with onions, salt, pepper, brown sugar, water, and kielbasa. Give everything a good stir and cover. Cook on high for 1 hour, then reduce to low and cook for an additional 6 hours, stirring occasionally. Serve.