Prepare the shrimp and put in either a Ziplock bag or a low-line baking dish.
In a small bowl, mix together the marinade: Olive oil, garlic, dark brown sugar, smoked paprika, cumin, salt, black pepper, lime juice and zest, tequila and chopped cilantro. Pour over the shrimp and marinate in the fridge for at least 30 minutes.
Soak bamboo skewers in water while shrimp is marinating.
Thread the shrimp onto the skewers. Pour a little bit of the marinade over the shrimp again, and then discard the rest of the marinade.
Preheat the grill to high medium-heat and lightly oil the grates so the skewers don’t stick.
Cook the skewers for 3-4 minutes per side, until shrimp turns pink, and is no longer opaque. The shrimp will have a char. NOTE: Smaller shrimp takes less time.
Place the skewers on a platter and serve.
For garnish, serve with fresh sliced lime and sprinkle with more chopped cilantro.