Butterly prawns from tail to the base of the head. Do not remove heads or shells. Devein and clean.
Mix together 2 tbsp olive oil, garlic, lime juice, paprika, and salt together. Marinate prawns for 30 minutes.
Heat campfire grill. Cook for 2 minutes per side and remove from grill. Toast Japanese chilis along side the shrimp. Heat tortilla for one minute per side.
Serve each taco with 2 prawns, cabbage, cilantro, queso fresco, toasted chilis, hot sauce, and a lime wedge.
Notes
Leaving the head and shells on the prawns makes for a dramatic presentation. They can be removed before serving if that is easier for your guests to eat.