Spice-Rubbed Butterflied Leg of Lamb

1/2 large onion, cut into 2-inch pieces
6 garlic cloves, peeled
2 tablespoons fresh mint leaves
2 tablespoons paprika
1 tablespoon salt
1 tablespoon fresh marjoram leaves
2 teaspoons ground black pepper
2 teaspoons ground cumin
2 teaspoons ground coriander
2 teaspoons hot pepper sauce
1 teaspoon turmeric
1/2 teaspoon ground ginger
1/4 teaspoon ground cinnamon
1/2 cup olive oil
1/3 cup fresh lemon juice
1 4 1/2- to 5-pound boneless leg of lamb, butterflied, fat and sinew trimmed

Combine all ingredients except lamb in a food processor. Process until a coarse paste forms. 

Place lamb in large resealable plastic bag. Pour spice mixture over lamb; seal bag. Turn bag several times and rub spice mixture into lamb. Refrigerate overnight, turning bag occasionally.

Prepare barbecue (medium heat). Remove lamb from marinade; shake off excess. Grill lamb to desired doneness or until instant-read thermometer inserted into thickest part of lamb registers 125°F to 130°F, for medium-rare about 15 minutes per side. 

Transfer lamb to cutting board. Cover with foil and let stand 5 to 10 minutes. Cut lamb into 1/3-inch-thick slices. Arrange on platter and serve.

Makes 6 to 8 servings.