Luksus, the Nordic tasting-menu-only restaurant hidden behind a door in Greenpoint’s Tørst beer bar, has been on my list for a long time as a Brooklynite who’d love to never have to leave the borough for her fine dining. I was scheduled to go see my family in Ohio over the July 4th weekend, but when my flight got canceled despite clear blue skies, I consoled myself by booking a table for two there in the hope of getting to sit at the bar and watch the chefs work. The OpenTable reviewers had given Luksus a 4.5, and Eleven Madison Park, which I would call one of the standard-bearers in…