Honolulu’s original contemporary American bistro turned five this year. And 12th Avenue Grill is only getting better. A dinner two weeks ago, with three discerning eatizen joes and a jane from San Francisco in tow, elicited surprised cries of delight. As usual, the specials were all instant winnahs. Like this starter of Big Island boar in a broth with gnocchi, hamakua mushrooms and other stuff (I just wanted to enjoy dinner and didn’t take any notes, gah). It is a quintessential “chasseur” dish that signals autumn is finally here.