Brown the Sausage: Heat a large skillet over medium heat and add half of the bacon grease (or olive oil). Place the sliced smoked sausage in the pan and cook for a few minutes until it's nicely browned and a little crispy. Remove the sausage and set it aside, leaving any delicious drippings in the skillet.
Sauté the Onions: In the same skillet, add the remaining bacon grease (or oil), along with the diced onion, salt, and pepper. Sauté for about 3-5 minutes until the onions begin to soften and lightly caramelize, bringing out their natural sweetness.
Add Garlic and Spices: Create a small space in the center of the pan and add the minced garlic. Cook for just about 20 seconds until fragrant, being careful not to let it turn brown, as this can make it taste bitter. Stir in the butter and smoked paprika, letting them toast for about a minute to release their rich aromas.
Deglaze with Vinegar: Pour in the apple cider vinegar, scraping up any browned bits from the bottom of the pan. This step adds a wonderful tangy flavor that perfectly balances the dish.
Cook the Cabbage: Add all the shredded cabbage to the skillet. Toss it thoroughly to coat with all the wonderful flavors. Sauté for 10-12 minutes, stirring occasionally, until the cabbage reaches your desired tenderness. Cook longer for softer cabbage.
Combine and Serve: Return the cooked sausage to the skillet with the cabbage. If you like a little kick, sprinkle in the optional red pepper flakes. Cook for a final few minutes until everything is heated through. Serve this simple, hearty, and healthy one-pot meal immediately!