Certain pockets of downtown Los Angeles feel like a real, contained, thriving city. Beef bourguignon torta from Fabby’s Sandwicherie The beef bourguignon torta from Fabby’s Sandwicherie in downtown L.A. “It’s very Mexican, very Los Angeles and very French in its essence,” Alejandro Guzmán says of his small sandwich shop, where he also serves beef tartare on a paper plate. Food …