What common citrus fruit is the yuzu sometimes mistaken for due to its appearance?

Small, bumpy grapefruit

The yuzu fruit frequently causes confusion among those unfamiliar with it because its physical characteristics—specifically its bright yellow color and puckered, bumpy texture—closely resemble a small grapefruit or a sour mandarin. This physical similarity is misleading because the actual flavor profile of the yuzu is distinctly different from these other citrus fruits, possessing a complex aromatic experience combining tart lemon, sour grapefruit notes, and sweet floral elements. This visual resemblance often leads to an incorrect initial assessment of its taste.