In large skillet over medium heat, melt 3 T butter. Add onion and garlic, cook until onion is translucent.

Add vinegar and kielbasa, cook until meat is slightly browned.

Add remaining butter, cabbage and paprika. Toss to coat cabbage. Add salt and pepper if needed.

Continue cooking until cabbage is wilted and slightly browned.

Top with parsley and red pepper flakes, if desired.