According to our ice-cream-sandwich informant, the best look this season is a bit retro, as demonstrated by these mouth-waterers just hitting the shelves at Bklyn Larder. They come in three irresistible flavors — hazelnut, espresso, and fior di latte — unrecognizable to anyone who has ever chased a Good Humor truck down the block. The chewy, chocolaty wafers, though, lack only the pinprick holes for verisimilitude. “I wanted them to be like the ones I had growing up, but better,” says the Larder’s Francine Stephens. Mission accomplished.