Joseph Boroski is a bit of an institution at this point. He’s trained and done the cocktails lists for a lot of the five-star hotels in town, for all of Ashley Sutton’s bars, for Quince, etc. But the mixology mercenary has finally set up his own shop at the end of a dark, damp alley. In fact, we’re not allowed to tell you exactly where. (Thonglor, odd numbers side, single digit soi, girls in red at the corner.) But you can chat him up on Facebook and he might send you a map. Is it worth the…