1. Combine cilantro, mayonnaise, jalapeno, garlic, 1 tablespoon oil, lime juice, and a pinch of salt in a blender and puree until smooth; transfer to a bowl and set aside.
2. Heat grill to high, then clean and oil grates. In a medium bowl, stir together cumin, coriander, garlic powder, paprika, and 1/2 teaspoon salt; add shrimp and remaining 1 tablespoon oil and toss until well coated. Thread shrimp onto 12 metal or soaked wooden skewers.
3. Place lime halves (cut side down) and shrimp skewers on grill, close lid, and cook, turning skewers once, until shrimp are lightly charred and cooked through and lime halves are well marked, about 5 minutes total. Serve skewers with sauce and limes on the side.
Source: Hannaford fresh Magazine, May - June 2018