A smooth, vibrant sauce made from toasted guajillo chiles and aromatics. This versatile family cooking base brings mild heat and fruity flavor to protein-rich meat dishes.
Wipe the guajillo chiles clean, remove stems and seeds, and toast them in a dry skillet over medium heat for 1–2 minutes per side until fragrant, being careful not to burn.
Combine toasted chiles with hot water in a bowl, submerging fully, and let soak for 15 minutes to soften.
While chiles soak, roast the tomato, half onion, and garlic cloves in a skillet over medium heat for 8–10 minutes until onions are translucent and tomato skin is blistered, turning occasionally.
Drain the softened chiles and add to a blender with roasted vegetables, oregano, cumin, and salt. Blend with 1 cup soaking water until perfectly smooth, pausing to scrape down the sides.
Heat vegetable oil in a saucepan over medium; strain the sauce into the pan (using a fine mesh sieve for extra-smooth texture), and simmer for 7–10 minutes, stirring frequently, until slightly thickened and flavors meld.