Wipe the chiles de arbol clean with a damp paper towel, then set aside to completely air dry.
Heat a large pan over medium heat. Add the sesame seeds and toast, stirring frequently, until lightly golden and fragrant. Immediately remove from the pan and set aside. Pour ¼ cup avocado oil into the pan. Fry the corn tortilla, turning as needed, until crisp and golden brown on both sides. Remove and set aside. Over medium-low heat lightly toast the chiles de árbol for about 5-10 seconds, stirring constantly, just until fragrant and slightly deepened in color. Avoid burning them as they can become bitter. Immediately remove from the pan and set aside.
Add the onion and garlic cloves to the same pan. Cook, stirring as needed, until tender and golden brown. Add the tomatoes and continue cooking until completely softened and their juices have released. Turn off the heat.
Stir the chiles de árbol back into the tomato mixture, Let the mixture cool slightly before blending.
Transfer the mixture to a blender. Crumble in the fried tortilla, then add the toasted sesame seeds, salt, and vinegar. Blend until smooth.
With the blender running at a steady speed, keeping the salsa moving without splattering, slowly drizzle in the remaining ¼ cup avocado oil in a thin, steady stream. Continue blending just until the oil is fully incorporated and the salsa is smooth, creamy, and emulsified. Transfer to a bowl, adjust the salt to taste if needed, and serve.