How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Pastai Ystumllwynarth (Welsh Oystermouth Pie).?

You need 10 ingredients. The key ingredients include: 1 lb potato (peeled), 1 tablespoon milk, 1 medium onion (chopped), 1 lb cod fish fillet (cooked, flaked), and more.

Is Pastai Ystumllwynarth (Welsh Oystermouth Pie). suitable as seafood?

Yes, Pastai Ystumllwynarth (Welsh Oystermouth Pie). falls under the Seafood category and is a great choice for this type of meal.

How do I store leftover Pastai Ystumllwynarth (Welsh Oystermouth Pie).?

Store leftovers in an airtight container in the refrigerator for up to 3–4 days. Reheat gently before serving.

Pastai Ystumllwynarth (Welsh Oystermouth Pie).

Name: Pastai Ystumllwynarth (Welsh Oystermouth Pie).
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 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

Bake this irresistible Pastai Ystumllwynarth (Welsh Oystermouth Pie). at home. Made with potato, milk, onion and fillet. Easy step-by-step instructions …

This Pastai Ystumllwynarth (Welsh Oystermouth Pie). relies on simple, everyday ingredients such as potato (peeled), milk, medium onion (chopped) and mustard powder. It comes together quickly and makes 4 servings, at about 181 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

Whether you're rounding off a family dinner, bringing a treat to a gathering, or simply satisfying a sweet craving, this Pastai Ystumllwynarth (Welsh Oystermouth Pie). delivers. Serve it warm or at room temperature, and add a scoop of ice cream or a spoonful of whipped cream for an extra-special finish.

Updated Jun 30, 2026

Serves 4 Seafood

Tips for the best results

Read through all the steps once before you start and measure out your ingredients first — it makes everything go more smoothly.
Preheat the oven fully and bake on the middle rack for the most even results.
Check for doneness a few minutes early — a toothpick in the center should come out with just a few moist crumbs.
Let it cool before slicing so it sets properly and holds its shape.
Store leftovers in an airtight container in the fridge and enjoy within a few days.

Variations & substitutions

Use a neutral oil or a plant-based spread in place of butter for a dairy-free version.

No specific allergen information. Please check the ingredient list for possible allergens.

My Personal Notes

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Pastai Ystumllwynarth (Welsh Oystermouth Pie).

Tips for the best results

Variations & substitutions

My Personal Notes

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Frequently Asked Questions