Drum roll please. March’s most popular recipe was… Chocolate Guinness Cake ! Maybe you made it for St. Patrick’s Day , or perhaps you just love chocolate cake (same). This one is ultra tender and already has a devoted following. As one reader instructs, “Drop everything you’re doing and make this asap.” I sat down with senior Test Kitchen editor Jesse Szewczyk, the recipe’s creator, to talk all things cake—and play a baking edition of FMK. Nina Moskowitz: Another month that BA Bake Club reigned supreme. Why do you think that is? Jesse Szewczyk: Because our audience has great taste. And who doesn’t love a good chocolate cake ? NM: Why did you develop this recipe? JS: We thought Chocolate Guinness Cake makes sense for March because of St. Patrick’s Day. Sometimes for Bake Club, we identify beloved classics we don’t already have on site, and find ways to put our own spin on them. NM: What’s the spin here? JS: The cake utilizes a technique called reverse creaming to make the crumb exceptionally tender.…