1-First: preheat the oven to 375 degrees Fahrenheit to get things started. Slice the kielbasa into 1-inch pieces, then make three to four 1/4-inch hasselback-style cuts on each piece without cutting all the way through, using chopsticks to guide the knife. This technique helps the flavors soak in evenly.

2-Next: place the pieces in a baking dish and mix them with the brown sugar, ketchup, and horseradish until well coated. Bake for 60 to 90 minutes, stirring every 20 minutes to ensure the sauce caramelizes and the edges brown nicely.

3-First Step: Prepare the Kielbasa: Slice 1 pound of kielbasa into 1/2-inch thick pieces and set aside. The cuts allow the glaze to penetrate, enhancing the flavor throughout. For substitutes, follow the same method to keep things consistent.

4-Second Step: Make the Glaze: In a mixing bowl, combine the ingredients to create the glaze, ensuring everything mixes well. This step is crucial for that sweet and savory balance that defines candied kielbasa.