Tender slow-roasted beef with fail-safe flourless gravy

Ingredients

• 1 tablespoon oil
• 2.5 kilogram Quality Mark topside roast (or choose a size that suits. See recipe tips for cooking time guide).
• 1 stalk celery, chopped
• 2 carrots, peeled and sliced
• 1 onion, chopped
• 1 cup red wine
• 1 1/4 cup beef stock
• 2 tablespoon Worcestershire sauce
• 1 tablespoon tomato paste
• 1 tablespoon balsamic vinegar
• 1 tablespoon brown sugar
• big pinch of mixed herbs
• salt to taste