Begin by heating a charcoal or propane grill.
Prepare your taco seasoning. Mix together: chili powder, cumin, paprika, coriander, garlic powder, salt, and chipotle powder (if using).
In a small bowl, whisk together vinegar and tomato paste.
In a large bowl, combine ground beef, taco seasoning, and tomato paste mixture. Mix well so the ingredients are well combined. Now add in chopped white onion.
Form into 6-8 patties. Grill for 3 minutes on the first side, then 5-6 minutes on the second side (for medium- medium well burgers).
Serve hot on a bun, romaine lettuce, or sweet potato slice and top with optional garnishes: guacamole, red onion, lettuce, cilantro, tomato, and jalapeño.