Tofu on 7th (between 3rd and 4th st) now has an authentic Sichuan menu. I've tried several entrees and they are excellent and definitely authentic.
Szechuan Garden (on 7th between 16th and Windsor) is new and claims to have authentic Sichuan food... but really doesnt. They even have a nice website (szechuangarden7ave.com) and a big paragraph talking about true Sichuan cuisine on their menu but the food is actually just americanized crap. No sichuan peppercorn used and everything is sweet. Very unfortunate.
Tofu on 7th
226 7th Ave, Brooklyn, NY 11215
463 7th Ave, Brooklyn, NY 11215