Kabobs:
Prepare grill to medium-high heat. Sprinkle shrimp evenly with salt and black pepper. Thread shrimp, bell pepper pieces, mango cubes, and onion alternately onto skewer. Place skewer on a grill rack coated with cooking spray; grill 2 minutes on each side or until shrimp are done. Squeeze juice from lime wedges over kebabs and serve with tomatillo salsa. Enjoy!
Tomatillo Salsa:
Preheat the oven to the broiler setting. Line a sheet pan with foil or parchment paper.
Place halved tomatillos cut side down on prepared pan. Add the garlic cloves (with their skin) to the same pan with the tomatillos. Place under the broiler for 5-7 minutes to lightly blacken the skins of the tomatillos. Remove from oven and allow to slightly cool. Remove papery skin from garlic.
Transfer the cooked tomatillos and garlic into a blender or food processor with the onion, jalapeño, cilantro, lime juice and salt. Blend until smooth. Taste and adjust seasoning with more cilantro, lime juice, or salt according to taste.