What specific ingredient is the subject of debate regarding its inclusion in the traditional Tortilla Española preparation?

Answer

Onion

While the foundation of the Tortilla Española—comprising eggs and potatoes cooked in olive oil—is considered sacred, the preparation method is subject to intense, ongoing debate among culinary enthusiasts. The most prominent argument revolves around the inclusion or exclusion of onion in the mixture. Additionally, another significant point of contention concerns the desired texture of the center, specifically how runny it should be when served. Despite these internal disagreements on technique, the basic composition remains universally recognized.

What specific ingredient is the subject of debate regarding its inclusion in the traditional Tortilla Española preparation?
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