Ahi tuna may be the most overserved dish in South Florida. It's often dull, chilled, and decorated with sesame seeds but otherwise tasteless. These ahi tacos are the much-needed exception. Imagine that a spicy tuna roll died, went to heaven, and discovered its true destiny — inside a crunchy shell, with ponzu sauce, creamy avocado, cucumber, and rice. The combination of contrasting textures, spices, and sweetness is a victory for everyone involved. Nothing is too mushy, too fishy, or too chewy. One problem: This dish is an appetizer, so the portions are small. Order several, and inhale them shamelessly.