Coriander and Cardamom Dusted Scallop Skewers with Roasted Garlic and Lemon Vinaigrette

Ingredients

• 24 sea scallops (about 1 3/4 pounds), tough muscles removed
• 4 tablespoon freshly crushed coriander
• 1 tablespoons freshly crushed cardamom
• Kosher salt
• Freshly ground black pepper
• 2 1/2 tablespoons olive oil plus more for the grill
• 1 bunch green onions, cut on diagonal into 1 1/2 inch lengths.
• 24 6-inch bamboo skewers, soaked in water for 30 minutes
• 1/3 cup extra virgin olive oil
• 4 garlic cloves, peeled
• 2 lemons, juiced