Fish tacos are already the fun, flip-flop-wearing, margarita-sipping member of the taco world, but this casual, sit-down spot in Beacon Hill makes them even more exciting. Stretchy flour tortillas come splattered like a Jackson Pollock painting with melty white cheese, then get stacked with a hunk of crispy cornmeal-breaded fish. And the real excitement happens when matchstick-thin green apple slices join a hodgepodge of red onion, cilantro, and tomato on top. The result is a little sweet, a little tart, and a nice refreshing contrast to all that buttery, flaky fish.