Sheet Pan Sausage with Cabbage and Pickled Onions

1 head green or red cabbage, halved, cored, and cut into 1-inch wedges (about 1 1/2 pounds)

1 red or yellow onion, halved and cut into 1/2-inch wedges

6 T. olive oil

1 tsp. kosher salt

Freshly ground black pepper

4 sweet or spicy Italian sausages

Quickled onions or 1 T. cider vinegar

Dijon mustard, for serving

 

Preheat the oven to 450°F. Toss together the cabbage, onion, and oil on a rimmed baking sheet. Season with the salt and several grinds of black pepper and nestle the sausages among the vegetables. Roast, shaking the baking sheet halfway through, until the cabbage is brown on the edges, 25 to 30 minutes. Turn the oven to broil and broil until the onions and sausages are browned, about 3 minutes more. Scatter the pickled onions over everything and serve with Dijon mustard.