Demand for reservations for Or’esh (450 W. Broadway, Soho) — the latest restaurant from the scenester-magnet Catch Group — is as intense as the flames on the custom-made charcoal grill in the kitchen. Live-fire cooking is rarer in New York than it should be, and it took O’resh owner Eugene Remm and chef Nadav Greenberg nearly a year to steer through the city’s regulations maze to make it happen. It was worth the trouble. At Or’esh , the open flame smokes and blisters one spectacular Israeli-