Coffee-Braised Pot Roast with Caramelized Onions

Preheat oven to 300°F.

Season beef with salt and pepper. Heat 2 teaspoons oil in a Dutch oven or soup pot over medium-high heat. Add beef and cook, turning from time to time, until well browned on all sides, 5 to 7 minutes. Transfer to a plate.

Add the remaining 2 teaspoons oil to the pot. Add onions, reduce heat to medium and cook, stirring often, until softened and golden, 5 to 7 minutes. Add garlic and thyme; cook, stirring, for 1 minute. Stir in coffee and vinegar; bring to a simmer. Return the beef to the pot and spoon some onions over it. Cover and transfer to the oven.

Braise the beef in the oven until fork-tender but not falling apart, 2 1/2 to 3 hours. Transfer beef to a cutting board, tent with foil and let rest for about 10 minutes.

Meanwhile, skim fat from the braising liquid; bring to a boil over medium-high heat. Add the cornstarch mixture and cook, whisking, until the gravy thickens slightly, about 1 minute. Season with pepper. Carve the beef and serve with gravy.