Heat a dry skillet over medium heat. Toast the guajillo chiles for 1-2 minutes until toasted and fragrant, flipping every 30 seconds so they don’t burn. Transfer them to a bowl and allow them to cool for 5 minutes.
Add the toasted chiles to a small blender or spice grinder, and blend them into a fine powder.
Transfer the ground chile powder to a small bowl and stir in the citric acid, sugar, and salt.
Taste and adjust if needed. Use as a garnish or seasoning on your favorite Mexican recipes.
Notes
Total yield: Makes about 1/3 cup total.
Storage: Store in an airtight jar at room temperature for up to 6 months. Keep it away from moisture, and it will stay fresh.