While culinary trends tend to take over menus in waves, poke is now hitting Denver with tsunami force, with entire eateries dedicated to the dish opening up in shopping centers and neighborhoods around town. Ohana Island Kitchen started as a walk-up joint serving Hawaiian specialties out the side door of the Truffle Table before moving across the intersection to 2563 15th Street last fall. Of Ohana’s half-dozen entrees, three are poke-based, ensuring that the popular little joint sells plenty of tuna, thus keeping supplies fresh.