Creamy potato mash, lamb shank & vegetables - Potato Nation

Ingredients

• 2 kg lamb shanks
• 30 ml (2 tbsp) olive oil
• 2 onions, quartered
• 2 garlic cloves, finely chopped
• 2 carrots, thickly sliced
• 45 ml (3 tbsp) Worcestershire sauce
• 250 ml (1 cup) beef stock
• 1 g tin whole peel tomatoes
• 2 bay leaves
• 4 large potatoes
• 45 ml (3 tbsp) butter
• 125 ml (½ cup) hot milk
• 45 ml (2 tbsp) butter
• Salt to taste