01 -
Boil the potatoes in salted water for 20 minutes. Let them cool, peel the skins, and cut into thin 5mm slices.
02 -
Cook the chorizo slices in a pan until they're crispy. Place them on paper towels to soak up extra oil.
03 -
Make a roux using flour and butter. Gradually pour in the milk, then mix in the tomatoes. Season well, then thicken it while stirring.
04 -
In a greased baking dish, start layering potatoes, chorizo, and the béchamel sauce. Finish it off with a topping of grated cheese.
05 -
Pop it in the oven at 180°C for 25-30 minutes. Wait until the top turns golden and bubbly.