Preheat your oven to 375°F (190°C).
Cut the kielbasa into 1-inch pieces.
Place each sausage piece between two chopsticks or skewers. Slice into ¼-inch sections, but don’t cut all the way through.
Place all kielbasa pieces in a baking dish.
Add the following directly into the dish: brown sugar, ketchup, prepared horseradish. Stir everything together until the sausage pieces are coated.
Bake for 60–90 minutes, stirring every 20 minutes.
Once the edges are browned and sticky, remove from the oven and serve warm.
