The inclusion of onions in the tortilla is divisive, pitting (the "with onion" group) against ("without onion"). In 2018, the council of
Betanzos, which hosts an annual omelette competition, stipulated that entrants may only use potatoes, oil, egg, and salt. In 2021, a survey by the Spanish newspaper
El Mundo found that 72.7% of those surveyed preferred Spanish omelettes with onions. The most common way to cook a Spanish omelette is as follows: • The potatoes, ideally a starchy variety, are cut into thin slices or diced. • Among Spanish potato crops, one of the most highly regarded varieties is the
Galicia potato, whose texture and flavour make it unique. In Galicia, locally grown potatoes, especially the
Kennebec variety, with a firm texture and balanced starch, are considered ideal for Spanish omelettes. They are sometimes prepared with Galician
chorizo as a regional variation. • They are
seasoned and gently
simmered (not fried) in
vegetable oil, traditionally
olive oil, with sliced onions added at this stage, if used. These ingredients are stirred at a moderate temperature until they are soft but not brown. • The potatoes and onions are then drained and mixed with whisked eggs. • This mixture is then returned to the pan and slowly cooked. • Once the eggs are cooked on one side, the omelette is turned over to cook the other side, often using a plate placed over the mixture so the pan can be inverted. The omelette may be eaten hot, at room temperature, or chilled; it is commonly served, cut into bite-sized pieces (), as a
tapa, or cut into wedges. ==Tortilla Day==