1 cup dried chiles de árbol, wiped clean with a moist towel, stems removed
½ cup pineapple vinegar or apple cider vinegar
Juice of 4 Mexican limes or key limes
1 teaspoon ground cumin
2 garlic cloves, peeled
Salt, to taste
Warm a dry comal or skillet over medium heat; toast the chiles quickly, taking care not to let them burn.
In a bowl, combine the toasted chiles, vinegar, and lime juice; let the chiles hydrate for 15 minutes.
In a blender, process the chiles, cumin, and garlic until smooth. Blend well, scraping down the paste as needed. Use a wooden spoon to push the mixture through a fine-mesh sieve into a small bowl, discarding the skins and seeds. Taste and add salt, as desired.