Mexico Viejo in Carlsbad serves counter-style Mexican food at 2508 El Camino Real, producing battered-and-fried fish tacos in doubled corn tortillas that rank among the corridor's most ordered single items. The fish taco uses a beer-batter dip and deep-fry method that produces a shatteringly crisp shell, loaded with cabbage, pico de gallo, and a lime crema — a textural contrast to the charcoal-grilled proteins at Luna Grill in the same El Camino Real commercial stretch. Breakfast burritos wrap scrambled eggs, cheese, and crispy potatoes into flour tortillas starting in the early morning, and the carne asada fries pile charbroiled steak over seasoned fries with guacamole, sour cream, and melted cheese. Portions run large enough that the three-taco plate and California burrito both function as shareable orders, a value-to-volume ratio common along this mid-Carlsbad corridor that also houses the pho and bun bowls at Phở Central. The rolled tacos arrive five to an order with guacamole, shredded cheese, and a red tomatillo salsa ladled across the top.