Healthy stir-fry

First we will cut the onion as we like. Then we will put it in a more or less large paella pan with a good splash of EVOO (over medium heat).

When the onion is golden brown, add the whole tomato with a little of its juice and a splash of olive oil and crush it until it is crushed.

Then add a little water to reduce the acidity and spices to taste (I always add pepper and oregano).

Finally we leave it over medium heat until we see that it is done (about 15-20').