Slow Cooker Pot Roast

Bahan-bahan (10 porsi)

• 1 tablespoon olive oil
• 4 pounds chuck roast (or blade roast, boneless and trimmed of excess fat)
• 2 yellow onions (chopped)
• 8 cloves garlic (smashed with the back of a spoon)
• 1 pound baby potatoes (white or Yukon gold, you may need to halve them if they are too large)
• 4 carrots (large, cut into 2-inch pieces)
• 2 celery stalks (cut into 1-inch pieces)
• 2 tablespoons Dijon mustard
• 1 tablespoon brown sugar
• 2 teaspoons dried thyme
• 2 teaspoons crushed bouillon
• 1 teaspoon salt (or to taste)
• 1/2 teaspoon black pepper (or to taste, freshly ground )
• 1 cup reduced-sodium beef broth
• 2 tablespoons plain flour (optional - for a thick gravy)
• 2 tablespoons parsley (fresh, chopped, to serve)
• 1/4 cup balsamic vinegar