A small, hot chili pepper commonly used in Mexican and Asian cuisine.
From Spanish 'chile serrano', literally 'sierra chili' (mountain chili), from 'sierra' (mountain or saw), because the peppers grow in mountainous regions.
The serrano pepper was one of the first chilis domesticated in Mexico, and its heat level (10,000-25,000 Scoville units) became the baseline for measuring pepper hotness—it's literally the international standard of 'medium spicy'.
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