This Chile de Arbol Salsa is very spicy, as the arbol chile pepper brings a lot of heat with it. The mixture of tomatillos and tomatoes creates a bright salsa with a slightly tangy taste, and the addition of cilantro gives it a fresh flavor.
Place 4 cups of water in a medium saucepan, add the arbol peppers and cook at medium heat. Once the water starts to boil, add the tomatoes, tomatillos, and garlic clove.
Once the ingredients have cooled, drain them and place in your blender along with the cilantro. Process this until you have a sauce with some texture. Pour it into a bowl and season with salt. Top with the diced white onion.