1Peel the garlic cloves by smashing them with the side of a knife.
2Lightly toast the garlic cloves and dried chiles in a skillet with olive oil over heat.
3Place the tomatoes and onion in a pot with water and boil until soft.
4Transfer the boiled tomatoes and onion, along with the toasted garlic and chiles, to a blender. Add a splash of the boiling water and salt, then blend until smooth.
5Pour the blended salsa into a bowl and stir in the fresh chopped onion and cilantro.