In a small bowl, cover the chiles with boiling water and let sit for 10 minutes (skip this step if using fresh chiles).
Drain the chiles, then transfer to a blender or food processor. Add the garlic, olive oil, lemon juice, cilantro and salt. Blend until smooth, leaving a vent to allow steam to escape.
Enjoy right away or keep stored in the fridge for up to one month. Enjoy!