To prepare marinade, combine all marinade ingredients in a food processor; process to a paste. To prepare chicken, coat chicken with marinade. Cover and refrigerate 4 hours or overnight.
Preheat oven to 350°F
Season chicken with salt and pepper; place on rack in roasting pan. Wrap garlic in foil and place alongside chicken. Roast 1 1/2 hours or until a meat thermometer inserted in thigh registers 170°F Remove from oven and let rest 20 minutes.
Reserve pan juices in the roasting pan. Add broth and lemon juice. Squeeze roasted garlic cloves into broth mixture. Whisk, stirring to loose brown bits, and simmer until slightly thickened. Serve with chicken.