Heat oven to 300 deg.
In large pot boil salted water. Add cabbage, when comes back to boil, boil for 3 min. Drain into colander and run cold water to stop cooking.
Add 1/3 of cabbage to baking dish, spread 1/2 meat, sprinkle with salt and pepper, dot with butter dots. Repeat ending with cabbage and butter dots.
Cover tightly with parchment, top with lid or aluminum foil. Large pyrex baking dish with lid works well.
Cook for 2 hr. Uncover and cook for additional 30 min. Serve with crusty bread and mustard.
Source NYT cooking app Sausage and Cabbage - Julia Moskin