Directions:

• In a large bowl, mix together the ground sirloin and chorizo using your hands. Set aside to let the flavors blend.
• Heat one tablespoon of oil in a skillet over medium-high heat. Add one chopped onion, and saute until tender. Transfer the onion to a blender, and add the red pepper, Ranch dressing, saffron, and paprika. Pulse until fairly smooth. Refrigerate until needed.
• Heat the remaining oil in a large skillet over medium heat, and add the remaining onions, brown sugar, salt and pepper. Cook and stir for about 15 minutes until the onions are golden brown. Set aside.
• Preheat the grill for high heat. Form the meat into four patties, slightly larger than the buns.
• Place burgers on the grill, and cook for 5 minutes per side, or until well done. Split buns in half, and spread butter on the inside. Place on the grill to toast briefly.
• Place burgers onto buns, and top with caramelized onion and the roasted pepper ranch sauce. Sprinkle with a few shavings of manchego cheese, and place the top of the bun on top.