Welsh Onion Cake

Experience a slice of comforting Welsh tradition with this irresistible Welsh Onion Cake, a hearty, rustic side dish that combines layers of tender potatoes, sweet caramelized onions, and rich, buttery goodness. This oven-baked classic is as simple as it is satisfying, featuring thinly sliced potatoes perfectly seasoned with salt and pepper, interwoven with melt-in-your-mouth onions sautéed until golden. Topped with a generous drizzle of melted butter for a crispy, golden finish, this dish is perfect as a cozy accompaniment to roasted meats or as a standalone vegetarian delight. With minimal ingredients and straightforward preparation, this traditional recipe delivers maximum flavor—ideal for family dinners or festive gatherings.

Nutriscore Rating: 46/100

Prep Time:20 mins

Cook Time:75 mins

Total Time:95 mins

Servings: 6

Ingredients

• 900 g Potatoes
• 500 g Onions
• 150 g Butter
• 1 tsp Salt
• 0.5 tsp Black Pepper

Directions

Step 1

Preheat your oven to 180°C (350°F) and grease a medium-sized ovenproof dish with a small amount of butter.

Step 2

Peel the potatoes and slice them thinly into rounds, about 1-2 mm thick. Use a mandolin slicer if available for even slices.

Step 3

Peel and finely slice the onions into thin half-moons.

Step 4

In a large frying pan over medium heat, melt half of the butter (75g) and add the onions. Cook them gently for about 10-12 minutes, stirring occasionally, until they are soft and lightly golden.

Step 5

Season the sliced potatoes with salt and black pepper, tossing them gently to evenly coat.

Step 6

Start layering the dish: Place a layer of potato slices at the bottom of the greased dish, slightly overlapping them. Add a layer of the cooked onions next. Repeat the layers, finishing with a top layer of potatoes.

Step 7

Melt the remaining butter (75g) and pour it evenly over the top layer of potatoes.

Step 8

Cover the dish with foil and bake in the preheated oven for 45 minutes.

Step 9

Remove the foil and bake for an additional 20-30 minutes, or until the top layer of potatoes is golden brown and crispy, and the potatoes are tender when pierced with a fork.

Step 10

Let the Welsh Onion Cake cool for 5 minutes before serving. Slice into portions and enjoy warm as a side dish or as a meal on its own.

Nutrition Facts

Serving size	(657.1g)

Amount per serving	% Daily Value*
Calories	1307.4

Total Fat 123.7g	0%
Saturated Fat 68.6g	0%
Polyunsaturated Fat 3.9g
Cholesterol 352.5mg	0%
Sodium 3151.5mg	0%
Total Carbohydrate 43.1g	0%
Dietary Fiber 8.8g	0%
Total Sugars 29.9g
Protein 5.7g	0%

Vitamin D 24IU	0%
Calcium 121.5mg	0%
Iron 1.6mg	0%
Potassium 904.0mg	0%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 85.1%

Protein: 1.7%

Carbs: 13.2%