Slow Cooker Black Forest Pot Roast

Bahan-bahan (6 porsi)

• 3½ pounds boneless beef chuck roast
• 1 large onion, (chopped)
• ¼ cup water
• 4 whole dried shiitake mushrooms, stems removed ((crumbled and rinsed))
• ¼ cup ketchup
• ¼ cup dry red wine
• 2 tablespoons Dijon mustard
• 1 tablespoon Worcestershire sauce
• ½ teaspoon salt
• ⅛ teaspoon black pepper
• 1 medium garlic clove, (crushed)
• 2 tablespoons cornstarch
• 3 tablespoons water