My Favorite Pot Roast

INGREDIENTS

• 1 tablespoon vegetable oil
• 1 (4 pound) beef pot roast
• 1 tablespoon brown sugar
• 1 tablespoon salt
• 1 tablespoon dry mustard
• 1/4 teaspoon black pepper
• 3 large potatoes, quartered
• 3 carrots, peeled and cut into 2-inch pieces
• 1 onion, sliced
• 1/3 cup vinegar
• 1/3 cup water