Using kitchen shears, cut off the stems of the chiles and cut them open. Remove the seeds and veins and discard.
Heat a cast-iron skillet over medium, then dry toast them for ~30-60 seconds per side, or until fragrant.
Bring a saucepan of water to boil, then turn the heat off, add the anchos in, cover the pot, and let the chiles rehydrate for 10-15 minutes, or until they feel soft and pliable.
Your chiles are now ready to be used in various recipes, from mole poblano and vegan chorizo to chamoy.
Notes
Nutritional information is a rough estimate and should not be taken as health advice.