This is a favorite breakfast dish in Spain. It works nicely for lunch and tapas too. It's so easy to make. And kids really like have fun with this. The most important thing is to have fresh ingredients. You can leave out the ham or the cheese or both if you wish and it will still be completely delicious. Make sure to use dry-cured ham. And paper thin slices. The cheese and ham slices, if used, should be thin enough that the taste of the bread, oil and tomato shine out.