WordNet (r) 3.0 (2006):

tangy
    adj 1: tasting sour like a lemon [syn: lemony, lemonlike,
           sourish, tangy, tart]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "tangy":
   brisk, burning, curried, high-seasoned, hot, hot as pepper, lively,
   nippy, peppery, racy, seasoned, snappy, spiced, spicy, with a kick,
   zestful, zesty, zippy