Shrimp Tikka With Fresh Mango Chutney

From Gourmet [1]

For shrimp:
1/4 cup vegetable oil
2 tablespoons fresh lime juice
1 (1-inch) piece fresh jalapeño, chopped (about 2 teaspoons)
1 (1-inch) piece peeled ginger, chopped
1 large garlic clove, smashed
2 teaspoons ground garam masala
3/4 teaspoons turmeric
1/8 teaspoons grated nutmeg
2 pound large shrimp in shell, peeled, leaving tail fan attached
For chutney:
1 teaspoon ground cumin
1 (3/4-pound) unripe mango, chopped
1/3 seedless cucumber, peeled and chopped (3/4 cup)
1/2 cup chopped red onion
1 to 2 teaspoons minced fresh jalapeño with seeds
3 tablespoons fresh lime juice
3 tablespoons thinly sliced mint
3 tablespoons chopped cilantro
10 (12-inch) wooden skewers, soaked in water 30 minutes
lime wedges, for serving

Marinate shrimp: purée all ingredients for marinating shrimp, except shrimp, with 1/2 tsp salt in a blender until smooth. Pour into a sealable bag, then add shrimp and marinate at cool room temperature, turning bag occasionally, 30 minutes.
Make chutney while shrimp marinate: Toast cumin in a dry small skillet over medium heat, stirring occasionally, until fragrant, about 1 minute.
Stir together remaining chutney ingredients with 1/4 tsp salt, then sprinkle with toasted cumin.
Make kebabs: prepare grill for direct-heat cooking over hot charcoal (medium-high heat for gas); Thread 4 shrimp onto each skewer, leaving small spaces between them. Put on a tray. Oil grill rack, then grill skewers, covered only if using a gas grill, turning once, until just cooked through, 4 to 6 minutes total. Alternately, shrimp can be cooked in a hot well-oiled large (2-burner) ridged grill pan, turning once, about 8 minutes total. Serve with chutney.

Serves 6.