Oven-baked lamb and vegetable casserole

Ingredients

• 1 kilogram boneless lamb leg, cubed
• 1/4 cup seasoned flour
• 1/4 cup olive oil
• 2 carrots, trimmed, chopped
• 2 celery stalks, trimmed, chopped
• 1 onion, chopped
• 2 garlic cloves, crushed
• 700 millilitre bottle tomato passata
• 2 cup beef stock
• 1/2 cup red wine
• 4 thyme sprigs
• 2 fresh bay leaves
• 125 gram button mushrooms
• parsley leaves, mashed potato, green beans to serve