Mom's Pot Roast

Bahan-bahan (6 porsi)

• One 4-pound chuck roast
• kosher salt and freshly ground black pepper
• 2 tablespoons canola or vegetable oil
• 1 large yellow onion, (peeled and quartered)
• 5 medium garlic cloves, (sliced)
• 4 cups (1 quart) beef stock
• 8 whole sprigs of fresh thyme
• 5 medium carrots, (cut into 1½-inch sections)
• 6 tablespoons unsalted butter
• ½ cup all purpose flour
• 3½ cups cooking liquid (from the roast)