Pastai Ystumllwynarth (Welsh Oystermouth Pie).

• 1 lb potato (peeled)
• 1 tablespoon milk
• 1 medium onion (chopped)
• 1 lb cod fish fillet (cooked, flaked)
• 1 ounce butter 1 egg (hard-boiled & chopped)
• 1 pinch mustard powder
• 2 teaspoons parsley (chopped)
• 1 pinch nutmeg or 1 pinch mace
• salt and pepper
• 1 little milk

1. Boil the potatoes in lightly salted water.
2. Drain well and mash them with the milk, a quarter of the butter and the seasoning and spices.
3. Melt half the remaining butter in a frying pan and sautee' the onion until soft.
4. Mix together with the potatoes and cod, then add the onion, hard-boiled egg and parsley.
5. Turn into a buttered pie dish, roughing up the top with a fork.
6. Sprinkle with a little milk and dot with the remaining butter.
7. Bake at 375 degrees for about 30 minutes until golden brown and serve.

potato, milk, onion, fillet, butter, mustard powder, parsley, nutmeg, salt, milk

Taken from www.food.com/recipe/pastai-ystumllwynarth-welsh-oystermouth-pie-425240 (may not work)