Pressed and shredded pork rinds cooked with chile sauce into a dense, flavorful filling. A unique Mexico City street food favorite that makes a satisfying, protein-rich taco filling.
Remove stems and seeds from the guajillo and pasilla chiles. Toast them in a dry skillet over medium heat for about 1 minute, pressing down with a spatula until fragrant but not burned.
Boil the Roma tomatoes in a saucepan with enough water to cover for 5 minutes until skins split. Remove tomatoes and let cool slightly.
Blend the toasted chiles, cooked tomatoes, onion, and garlic cloves together with 1 cup of the tomato boiling water until you have a smooth, thick sauce.
Heat the vegetable oil in a large skillet over medium-high heat. Pour in the blended chile sauce and fry for 4-5 minutes, stirring, until the sauce darkens slightly and thickens.
Stir in the chicharrón prensado, reduce heat to medium-low, and cook uncovered for 10-12 minutes, stirring often, until pork rinds soak up the sauce and the mixture becomes dense. Season evenly with salt and pepper before serving.