Step 1

Add butter to a saute pan set over medium heat. Once melted add the chopped onion and saute until beginning to turn golden brown, then add sliced kielbasa. Cook until sausage is seared and heated through.

Step 2

Add sauerkraut to the kielbasa mixture, along with brown sugar and mustard. Stir to combine.

Step 3

Cook for 5 minutes, or until most of the liquid has cooked out. Then serve immediately.