1. Chop the tomato and onion into thin strips.
2. Bring a frying pan to medium heat, add a little olive oil and add the vegetables.
3. Stir constantly until golden brown.
4. Beat the eggs and add them to the pan.
5. Add spices to taste and cover.
6. When the tortilla is medium-rare, uncover and turn it over.
7. Cook, uncovered, for 1 minute more.