Instructions

  1. Cook the potatoes in boiling water until tender.
  2. Drain and mash with the 2 tablespoons butter, milk, salt and pepper.
  3. Beat the egg yolk through.
  4. Set the mash aside.
  5. Heat the 1 tablespoon of butter in a pan and add the onion, cook until softened.
  6. Add the flour and cook, stiring for 2 minutes.
  7. Add the beef stock and whisk until smooth.
  8. Season with salt and pepper and add the mixed dried herbs.
  9. Add the carrot, lamb and peas, then transfer all into a 2 litre casserole dish.
  10. Cover with the mash, roughing it up with a fork, to help brown the top.
  11. Bake in a moderate oven for about 45 minutes or until well heated through.