Butterflied Leg of Lamb Marinated in Yogurt and Mint

Name: Butterflied Leg of Lamb Marinated in Yogurt and Mint
Ingredients: 1 cup plain yogurt; 2 tablespoons fresh lemon juice; 1 tablespoon olive oil; 4 scallions, finely chopped; 3 large garlic cloves, minced, plus 1 large clove garlic; 1/4 cup chopped fresh mint; 2 tablespoons chopped fresh thyme; Grated zest of 1 lemon; 1 tablespoon cracked black pepper; Salt to taste; 1 (4 to 5 pound) butterflied leg of lamb; Vegetable oil cooking spray; 1/3 cup extra-virgin olive oil; 1 large clove garlic, crushed