A minor triumph as far as "tapas del mar" go, this ahi tuna is a must-order at Bin 555. It sits in an ocean of emerald spicy basil "olio santo," and is served with grilled roma tomatoes, shallots, chives and sea salt. From a visual standpoint, the sesame-crusted flat-bread appears to guide the plate - a sail in a multi-colored sea. It does more than look spectacular, however. The paper-thin crackers serve as a crunchy textural counterpoint to the soft, sweet tuna.