Place the vegetable oil, beer, scallions, garlic, cumin and onion in the blender and blend until smooth consistency.
Season the chicken wings with salt and pepper. Place the wings in a bowl and add the marinade on top. Refrigerate for 3 hours or overnight.
Preheat the oven to 400 degrees F.
Lay the wings in a single layer on a baking sheet. Bake for 30 minutes or until the skin gets crispy and the wings are cooked through.
Meanwhile, place all the cilantro sauce ingredients in a food processor and process until finely chopped. Transfer to a bowl and set aside.
Transfer the wings to a serving plate and serve with cilantro sauce on the side.