To prepare tortitas:

Mash the potatoes, add the tuna in little pieces, the yolks, the flour, the cheese, and salt and pepper and work with this to get a firm paste. If it is needed you can add flour.

Mix the white of eggs to get firm and add to the potatoes, work the paste just a little to mix well.

Form circles about 6 cm. by 1.5 cm. thick and fry them with medium low heat. When dark golden are ready. Place them on kitchen paper to absorb the oil.

To prepare the sauce:

Prepare a puree with the tomato, garlic, chipotle to taste, and some of the small stripes of onion. Saute the rest of the onion in a pot, and add the puree, fry well, add water if it is needed to get a nice sauce. Add the oregano and salt, if your tomatoes are a little sour add a bit of sugar.

Serve this tortitas in a bed of beautiful lettuce leaves and the sauce on top.