The secret to a great taco is in the tortilla, and the ones made at Salvadoran/Mexican restaurant El Guanaco are topnotch. In typical Salvadoran style, the tortillas are prepared thick and made to order. The soft little discs of masa come out a quarter-inch thick and almost creamy on the inside, with a perfectly griddled exterior that folds lovingly around fillings such as moist, chipotle-enhanced chicken breast and slow-stewed lengua. Graced with just the right amount of cilantro and onion, a squirt of lime, and some of El Guanaco's tingling green chili salsa, these tacos are impossible to resist.