What specific ingredient inclusion in Tortilla Española sparks one of the most enduring culinary debates in Spain?

Answer

Onion (cebolla)

The enduring culinary debate within Spain surrounding the Tortilla Española centers on the inclusion or omission of onion, referred to as cebolla. Proponents of the tortilla sin cebolla argue for preserving the pure flavor profile derived solely from the potato and egg. Conversely, those who insist on its necessity claim that the slow-cooked onion provides essential moisture and a depth of sweetness that enhances the overall texture and flavor of the thick omelette. Experiencing a version with well-cooked onion results in a notably different sensory experience compared to the purely potato and egg counterpart.

What specific ingredient inclusion in Tortilla Española sparks one of the most enduring culinary debates in Spain?
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