Spice-dusted Chicken Skewers with Harissa Yogurt Sauce

Ingredients

• 12 bamboo skewers, about 5 to 6-inches long
• 1 1/2 teaspoons whole cumin seeds
• 1 whole cardamom pods
• 1 1/2 teaspoons crushed whole coriander seeds
• 1 1/2 teaspoons whole fennel seeds
• Salt and freshly ground black pepper
• 1 3/4 pounds boned chicken breast, cut into 3/4-inch pieces
• 2 tablespoons extra virgin olive oil
• 1 ¼ cups Greek yogurt
• 1 ½ tablespoons freshly grated ginger
• 1 to 2 teaspoons harissa paste