In a pan over medium heat, add 3 tbsp of butter. Add the onion and garlic and cook about 4 minutes.
Add red wine vinegar to the onion and mix.
Add sliced sausage and cook another 4 minutes until slightly browned.
Add the rest of the butter, cabbage, paprika, salt, and pepper. Mix to combine everything together
Continue to cook until cabbage is softened a little, but not too much, you want to have a crunchy texture.
Garnish with fresh parsley and crushed red pepper flakes before serving.