Grilled Rosemary Shrimp Skewers

Name: Grilled Rosemary Shrimp Skewers
Ingredients: 1 head roasted garlic; 1 cup mayonnaise; 1/2 lemon, juiced; 1 tablespoon thinly sliced fresh chives; 3 cloves garlic, finely chopped; 2 tablespoons chopped fresh rosemary leaves, plus more for garnish; 1/3 cup olive oil; Pinch of red pepper flakes; Pinch of salt and freshly ground pepper; 1 pound extra-large shrimp (16 to 20 shrimp to the pound), peeled and deveined; Bamboo skewers, soaked in water for 30 minutes