It wasn’t love at first anything for Anna Sonenshein when she met Niki Vahle while working at Son of a Gun in 2018. Rather, it started with a feud. Sonenshein worked as a host, Vahle as a sous chef. She mostly ignored him. “I was fed up with the kitchen thinking they were better than front-of-house,” she told me, on speakerphone, from the home they now share. “It’s such a common thing in restaurants, and I hate it.” But, like all good star-crossed stories, the pair fell in love. “And I beat all that out of Niki,” Sonenshein said. “She did,” he called from a distance, as he wrangled one of their two dogs, Chicken. “We don’t tolerate any of that now in our restaurant.” The restaurant in question is the Michelin Guide-inducted Little Fish, which the couple started as a pop-up out of their kitchen window in 2020 and has expanded to two locations: Echo Park and Melrose Hill. With Little Fish, Sonenshein and Vahle unapologetically mix business, pleasure, family, friendship and food. Friend …