Remove the stems of chilli peppers. Peel the garlic and slice it. Set aside.
In a medium saucepan put half a cup of oil and heat over low heat. Fry the garlic until golden and crispy (about 1 min).
Place in a blender together with the oil you used.
Add another half a cup of oil to the saucepan and heat over low heat. Fry the chilies for a minute until they are crispy (see notes).
Place them in the blender together with the oil where they were fried.
Add to the blender the sesame seeds, salt, and a tablespoon of vinegar.
Blend for 2-3 minutes depending on how you’ll like the consistency of the sauce.
Pour the sauce into a jar and add a good drizzle of oil on top.
Please be extremely careful when frying chiles de árbol, they are very hot and release a strong and pungent smell that could cause respiratory problems if you’re not used to it. Open all windows for a better ventilation on the room and turn on the vent hood to full power.