In casserole dish, mix together brown sugar, taco sauce and Southern Comfort and stir until sugar is dissolved.
Toss in kielbasa pieces and bake for approximately 30 minutes uncovered then another 30-45 minutes covered, stirring every 15 minutes until sauce is thickened and coats kielbasa. If necessary, bake longer.
Remove from oven and allow grease to settle. Spoon off excess grease and serve warm as an appetizer.