Bill Esparza, author of StreetGourmetLA, contributor to Los Angeles Magazine's Digest blog and creator of Tacolandia, was our guide in Baja. He explains that the beer battered tacos with crema agria (Mexican sour cream) started as a snack for the fisherman. There is speculation that the Japanese fisherman working off the coast of Ensenada introduced the locals to tempura, hence the battered and fried fish.