I have now been to Zengo twice, and my experience is overall, underwhelming. the bar downstairs has some interesting cocktails, and i met up with friends there for drinks. they got there well before me, and advised me that the caipirinhas were not well made and had to be sent back. i was happy to see that they carry one of my favorite gins (tanqueray rangpur), and the midnight karma they made with it was good, but the service at the tables near the downstairs bar left a great deal to be desired. it was difficult to get noticed by wait staff, and the wait staff seemed to constantly change.
i still wanted to try the food, as it seems quite eccentric and interesting. i went with a friend and we decided to order a series of small plates and simply share. in the upstairs dining room the service was excellent, and our first couple of dishes were good. the mustard mashed potatoes were the first to come out, and i thought they were delicious. not too much mustard, but just enough to clearly announce itself. the scallop gyoza from the chinese new year menu were excellent, though i was not a huge fan of the sauce they chose to pair it with, and found myself preferring simply soy sauce. to be fair though, i have met few dumplings of which i am not a fan. the unagi-shrimp tempura roll was relatively simple, with none of the crunchiness i was expecting from tempura. the thai chicken empanadas were also simply empanadas, which though i enjoyed, did not wow me, and i did NOT like the associated sauce which reminded me more of curry than chiles. finally, the won ton tacos were quite tasty, and presented on the plate beautifully, though difficult to eat, because the won ton shell broke apart so easily.
overall, though there were some highlights, i was not thoroughly impressed by zengo, and for each individual dish would probably go to other restaurants which do them better (i.e. sushi, tacos, empanadas). but there were definitely some interesting flavor combinations, and may be worth a try if you are feeling adventurous and want a variety of different options in one menu.