1Preheat your oven to 180°C (350°F).
Peel and slice the potatoes into thin rounds.
Boil the potato slices in salted water for about 10 minutes until they are just tender. Drain and set aside.
In a large skillet, heat some oil over medium heat. Add the chopped onion and sauté until translucent.
Add the minced garlic and chopped hot peppers to the skillet and cook for another 2 minutes.
Stir in the chopped tomatoes and cook until they start to soften.
Add the tuna to the skillet, breaking it up with a spoon, and mix well with the vegetables.
In a baking dish, layer half of the potato slices on the bottom.
Spread the tuna and vegetable mixture over the potatoes.
Top with the remaining potato slices.
Cover the dish with foil and bake in the preheated oven for 20 minutes.
Remove the foil and bake for an additional 10 minutes until the top is golden and crispy.
Let the casserole cool for a few minutes before serving.