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If it is from Taiwan, it could be 文旦柚子,Wendan pomelo. It is the most grow pomelo in Taiwan.
Pomelos of that type are very common in Asia (China, Vietnam). But are not the typical pomelo sold in the U.S. (Chandler pomelo, with a pink inside).I actually prefer the Asian pomelo (although Chandler is not bad). Majority of American consumers prefer sweeter and prefer no seeds.