Vegetarian Portobello Pot Roast

Bahan-bahan (6 porsi)

• 1.25 pounds Yukon gold potatoes, cut into bite-sized pieces
• 1 pound baby bella mushrooms (if they are large, cut them in half)
• 2 large carrots, peeled and cut into bite-sized pieces
• 2 cups frozen pearl onions*
• 4 cloves garlic, peeled and minced
• 3 sprigs fresh thyme
• 3 cups vegetable stock, divided
• 1/2 cup dry red or white wine
• 3 tablespoons tomato paste
• 2 tablespoons vegetarian Worcestershire sauce*
• 2 tablespoons cornstarch
• Kosher salt and freshly-cracked black pepper
• optional garnish: finely-chopped fresh parsley