Tuna Potato Gratin with Melty Cheese

Creamy layered potatoes with tuna, golden onions, and a melty cheese top—simple, hearty, and irresistibly cozy.

Ingredients

• 1500 g potatoes (thinly sliced)
• 400 g tuna in water, drained
• 150 g yellow onion (thinly sliced)
• 200 g melting cheese (grated)
• 2 tbsp olive oil
• 1 tsp salt (to taste)
• 1/2 tsp black pepper
• 1/2 tsp paprika (optional)
• 2 tbsp chopped fresh herbs (parsley or chives), plus extra for garnish

Directions

1. Prep: Preheat oven to 375°F (190°C). Lightly grease a medium baking dish.
2. Par-cook potatoes (optional but recommended): Bring a pot of salted water to a boil. Add sliced potatoes and cook 5 minutes until just tender. Drain and let cool slightly.
3. Sauté onions: Heat olive oil in a skillet over medium heat. Cook onions with a pinch of salt for 5–7 minutes until soft and lightly golden. Remove from heat.
4. Season tuna: Flake the drained tuna in a bowl. Season with pepper, paprika (optional), and half the chopped herbs.
5. Layer: Arrange half the potatoes in the dish. Top with half the sautéed onions and half the tuna. Sprinkle with a little salt and pepper. Repeat layers with remaining potatoes, onions, and tuna.
6. Cheese: Scatter the grated melting cheese evenly over the top.
7. Bake: Cover loosely with foil and bake 20 minutes. Remove foil and bake another 15–20 minutes until the top is golden and the gratin is bubbling at the edges.
8. Finish: Rest 10 minutes, garnish with remaining herbs, and serve warm.

Details

• Prep Time: 20 minutes
• Cook Time: 35–40 minutes
• Total Time: ~1 hour
• Servings: 6

Tip: For extra creaminess, drizzle 1/2 cup milk or cream over the final layer before adding cheese.