Spain's great potato and onion omelette: thin-sliced potatoes and slow-cooked onions set in egg, turned with confidence at the critical moment: the most debated dish in Spanish cuisine, and the most eaten
Origin: Spain
From the journey of Onion.
Tortilla española, the Spanish potato omelette, is simultaneously the most beloved and most debated dish in Spanish cuisine. Every Spaniard has an opinion on it. The central controversy: should it contain onion? The 'con cebolla' (with onion) faction, which dominates in most of Spain, argues that slow-cooked onion sweetens the potato, enriches the egg, and adds the complexity that transforms tortilla from a simple potato omelette into something great. The 'sin cebolla' (without onion) faction, centred in Madrid, considers the onion an adulteration of the pure potato-and-egg preparation. This debate, entirely sincere, conducted with the gravity of a constitutional question, reflects the central role of onion in Spanish identity. The first written recipe for tortilla de patatas appears in 1798 in a Navarran document; by the 19th century it was established across the country as the universal everyday preparation, eaten at every meal, sold at every bar, carried in every lunch box.
The 'con cebolla' debate is not trivial. A 2015 survey by the Spanish newspaper El País found the country divided approximately 60% in favour of onion and 40% against. The Basque Country and Catalonia lean strongly toward the onion version; Madrid and Castile are more likely to make it without. There is no correct answer; both produce excellent tortillas. The recipe here is the 'con cebolla' version because the slow-cooked onion genuinely enriches the dish. The tortilla is also the foundation of one of Spain's great sandwiches: the bocadillo de tortilla; a thick slab of room-temperature tortilla in a crusty roll with olive oil; which is the most common lunch in Spain.
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