What characteristic physically distinguishes Citrus medica from smoother citrus relatives?

Answer

An exceptionally thick rind

The citron, scientifically known as *Citrus medica*, is visually set apart from common citrus fruits like lemons or oranges primarily by the substantial size and thickness of its rind or peel. This thick rind significantly alters the pulp-to-rind ratio compared to its relatives. This structural difference is not just aesthetic; it means that a much larger portion of the fruit mass is dedicated to the peel, which houses concentrated essential oils and zest, differentiating its nutritional profile and culinary utility, such as its use in candying, from fruits where the juice is the primary component utilized.

What characteristic physically distinguishes Citrus medica from smoother citrus relatives?
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