Roast lamb with vegetables & gravy

Name: Roast lamb with vegetables & gravy
Prep time: 45 min
Cook time: 3 h
Total time: 3 h
Yield: 10 portions
Ingredients: 3 sprigs fresh rosemary; 4 garlic cloves; 1 onion; 1 carrot; 1 stalk celery; 300 ml red wine; 2500 g lamb leg; sea salt; ground black pepper; 2 tbsp Dijon mustard; 150 g day old bread; 20 g mixed fresh herbs; 60 g extra virgin olive oil; 5 parsnips; 6 carrots; 900 g water; 20 g tomato paste; 1 - 2 dashes Worcestershire sauce; 1 tsp VEGEMITE®; 1 ½ tsp Vegetable stock paste; 1000 g red potatoes; 300 g raw beetroots; sea salt; ground black pepper; extra virgin olive oil; 30 g plain flour; 1 broccoli; ½ cauliflower