My friend Meredith and I live mere blocks from each other in Brooklyn, but since my dining is done almost exclusively in Manhattan, I rely on her to tell me what’s good in the neighborhood. She recently recommended the sandwich shop Saltie, saying, “I had their Scuttlebutt sandwich 2 weeks ago and CAN’T stop thinking about it.” I don’t do olives, so instead I tried the Clean Slate, and OMG, you guys, I CAN’T STOP THINKING ABOUT IT. It’s hummus, quinoa, pickles, and yogurt on naan, and the memories of its craveable sourness just keeps invading my brain. $8 seemed a little steep to me until I got the thing…