Beef Roast in Red Wine (Carni Arrosto Al Vino Rosso)

1 small onion, very thinly sliced 3 1/2 pounds boneless beef chuck roast 1 teaspoon kosher salt 1 teaspoon freshly ground black pepper 4 large cloves garlic,[...]

1 (3 -4 lb) chuck roast (okay to use from frozen state) 1 small onion , very thinly sliced 4 large garlic cloves , very thinly sliced 3 cups full-bodied red[...]