Simplicity. In the food world, this is an often overlooked attribute. But not at Tacos D.F. When you order an asada taco here, you get a generous pile of chopped, marinated carne asada taken fresh off the grill (along with whatever grilled onions were stuck to it) and wrapped in a fresh tortilla. That's it. But that's more than enough. The flavor is amazing -- blood and char and caramelized-onion sweetness -- and though many varieties of salsa are available at the repurposed salad bar, the best accompaniment to these tacos is a squeeze of lime. Also not to be missed: the pork tacos with a smear of blazing-hot green tomatillo salsa, which are the best thing to come from a pig since bacon.