Heat BBQ grill to medium heat.
Combine chorizo and beef and mix well . Add minced garlic, black pepper, cayenne and salt and pepper, combine well. Form 6-8 patties.
Grill over medium flame do not turn until you have nice grill marks on the burger. Cook until internal temperature reaches between 150° F to 160° F depending on your preference. I used the keto low carb sandwich thins on this burger for a low carb option. Link to purchase these thins is above in recipe.
For the Pasilla Aioli: Roast the Pasilla chile in broiler or stove top until the skin is brown and charred 15 min or so. Place chile in a bowl, cover with plastic wrap. Let the chile sweat for 20 minutes. Peel skin off and remove seeds.
In a blender, add pasilla chile, 1 C mayonnaise, 2 garlic cloves, juice from 1 lime, 1 T olive oil and a pinch of salt and pepper. Drizzle over burgers. Enjoy!