Grilled Shrimp Skewers on Rosemary Sprigs

Name: Grilled Shrimp Skewers on Rosemary Sprigs
Prep time: 15 min
Cook time: 5 min
Total time: 20 min
Cuisine: Mediterranean
Ingredients: 1 lb shrimp (25-30 per pound, peeled and deveined); 9-10 sprigs fresh rosemary (with sturdy stems (about 1 sprig per 3 shrimp)); 1 garlic clove (minced or pressed); 1 tsp lemon zest; 1 tsp fresh thyme; 1 tsp fresh oregano; 1 tsp fresh rosemary (chopped); 1/4 tsp salt; 1/4 tsp pepper; 1 pinch red pepper flakes; 1 tbsp extra virgin olive oil (plus more for brushing the grill)