In the blender, combine all the ingredients for the salsa. Blend until smooth, taste for salt and set aside.
In a large skillet, preheat the 2 tablespoons of grapeseed or canola oil for 2 minutes at medium heat. Add the onions and chile pepper rings and cook for 2 minutes.
Add the salsa from the blender, bring to a boil, reduce heat and cook 6 minutes. Add the chicharron and continue cooking for 8 minutes or until the salsa thickens and chicharron soften.
Serve on tostadas with beans or warmed tortillas. Garnish with avocado. Yields up to 4 servings.