Slice Kielbasa:
Cut the kielbasa into 1-inch pieces.
Hasselback the Kielbasa (Optional):
For added flavor, place each piece between two chopsticks or skewers on a cutting board. Slice the top of each piece into 1/4-inch cuts, stopping when your knife hits the sticks. This creates shallow slices that hold more sauce.
Arrange in Baking Dish:
Place the kielbasa pieces in a baking dish in a single layer.
Add Sauce:
Add the brown sugar, ketchup, and horseradish directly to the baking dish. Stir until all the kielbasa pieces are evenly coated with the glaze.
Bake & Caramelize:
Bake for 60–90 minutes, stirring every 20 minutes to ensure even caramelization. Cook until the glaze is thickened and the kielbasa edges are browned and sticky.
Serve:
Let the bites cool slightly before serving.
