Grilled Tandoori Lamb

Name: Grilled Tandoori Lamb
Yield: 6 Servings
Ingredients: 2 tablespoons cumin seeds; 2 teaspoons fennel seeds; 2 teaspoons cardamom seeds; 1/2 teaspoon whole black peppercorns; 1 1/2 teaspoons dried crushed red pepper; 6 tablespoons olive oil; 2 tablespoons minced fresh ginger; 4 garlic cloves, pressed; 1 5 3/4-pound leg of lamb, boned and butterflied (about 4 pounds boned)