Step 1

Heat bacon drippings in a Dutch oven over medium heat. Cook and stir onion in hot drippings until soft and translucent, about 5 minutes. Stir diced apple and caraway seeds with the onion and cook until apple is just tender, about 3 minutes more. Add sauerkraut and stir.

Step 2

Stir white wine, chicken stock, and brown sugar together in a bowl; pour over the sauerkraut mixture.

Step 3

Put pork roast into the bottom of the crock of your slow cooker. Pour sauerkraut mixture over the pork.

Step 4

Cook on Low until the pork easily falls apart when pulled with a fork, 6 to 8 hours; add kielbasa sausage pieces and continue to cook until the sausage is heated through, 15 to 20 minutes more.