Welsh onion cake

Welsh onion cake is a traditional dish featuring layers of thinly sliced potatoes, onions, and leeks, enriched with butter and topped with parmesan cheese. It's a comforting option perfect for meals or special occasions.

12 Feb 2026
Cook time 105 min
Prep time 50 min

Ingredients:

1/2 cup butter
2 onions
1 leek
5 potatoes
1/2 cup grated parmesan cheese
Welsh onion cake

Welsh onion cake is a hearty, traditional dish from Wales that combines layers of thinly sliced potatoes, onions, and leeks, all enriched with butter and topped with parmesan cheese. This comfort food is perfect for a cozy meal or as a side dish for a special dinner. Its simplicity and rich flavors make it a beloved classic. Let's get cooking!

Instructions:

1. Prepare the Vegetables:
- Peel and thinly slice the onions.
- Clean the leek thoroughly, removing any dirt. Slice the leek thinly.
- Peel and thinly slice the potatoes.
2. Cook the Onions and Leek:
- In a large skillet, melt 1/4 cup (55g) of the butter over medium heat.
- Add the sliced onions and leek to the skillet, cooking them until they are soft and translucent, about 8-10 minutes. Stir occasionally to prevent sticking and distribute the heat evenly. Once cooked, remove from heat and set aside.
3. Prepare the Potatoes:
- While the onions and leek are cooking, place the potato slices in a pot of salted water.
- Bring to a boil, then reduce the heat and simmer for about 5-7 minutes or until they are just tender but not falling apart. Drain the potatoes and set aside.
4. Assemble the Cake:
- Preheat your oven to 375°F (190°C).
- Grease an 8-inch (20 cm) round baking dish with a small amount of the remaining butter.
- Arrange a layer of potato slices at the bottom of the baking dish.
- Spread a portion of the cooked onion and leek mixture over the potato layer.
- Repeat these layers, alternating between potatoes and the onion-leek mixture, until all ingredients are used, finishing with a layer of potatoes on top.
5. Add Butter and Cheese:
- Dot the top layer of potatoes with the remaining 1/4 cup (55g) of butter, cut into small pieces.
- Sprinkle the grated parmesan cheese evenly over the top.
6. Bake the Cake:
- Cover the baking dish with aluminum foil and bake in the preheated oven for 35 minutes.
- Remove the foil and bake for an additional 15-20 minutes, or until the top is golden brown and crispy.
7. Serve:
- Let the Welsh Onion Cake cool slightly before serving. This will help it to set and make it easier to slice.
- Serve warm as a side dish or a main course.

Welsh onion cake is a delightful mixture of simple ingredients that come together to create a dish bursting with flavor and comfort. The buttery layers of potatoes, onions, and leeks, combined with the savory touch of parmesan cheese, make it irresistible. Whether you serve this as a main course or a side dish, it is sure to be a hit among your family and friends. Enjoy this traditional Welsh recipe and bring a piece of Wales into your kitchen!

Welsh onion cake FAQ:

What is the baking time for Welsh Onion Cake?

The Welsh Onion Cake should be baked covered for 35 minutes at 375°F (190°C), then uncovered for an additional 15-20 minutes until the top is golden brown.

How can I tell when my Welsh Onion Cake is done?

The cake is done when the top is golden brown and crispy. You can also insert a knife into the center; it should come out clean if fully cooked.

What is the best way to store leftovers?

Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. Reheat in the oven or microwave before serving.

Can I substitute the potatoes with another ingredient in this recipe?

Yes, you can substitute potatoes with sweet potatoes or even zucchini, but cooking times may vary, especially for zucchini, which cooks faster.

What size pan should I use for Welsh Onion Cake?

Use an 8-inch (20 cm) round baking dish as specified in the recipe for optimal layering and baking.

Tips:

- Use a mandoline or sharp knife to slice the potatoes evenly, ensuring they cook uniformly.

- Opt for a combination of white and yellow onions for a deeper flavor profile.

- You can substitute the parmesan cheese with cheddar or another cheese of your choice for a different taste.

- Make sure to season each layer of potatoes and onions with a bit of salt and pepper to enhance the flavors.

- If you want a crispier top, you can broil the cake for the last few minutes of baking.

Nutrition per serving

8 Servings
Calories 250kcal
Protein 4.83g
Carbohydrates 30g
Fiber 3.79g
Sugar 4.31g
Fat 13g

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