In a separate bowl mix together the garlic, onion, parsley, and 4 teaspoons (20 ml) of the butter mixture to form a coarse paste.
3 cloves garlic, 1/4 cup onion, 2 tbsp parsley
Brush the chicken quarters with some of the remaining butter mixture, sprinkle with salt, and broil, skin side down, under a preheated broiler for 5 minutes.
3 lbs chicken quarters, Salt
Baste again and continue broiling for 5 more minutes.
Turn the chicken skin side up and baste again.
Broil another 10 to 15 minutes, basting every 5 minutes, until the juices run clear when a thigh is pierced with the tip of a knife.
Spread the onion mixture over the chicken using a metal spatula to pat it firmly into place and continue broiling until the coating is lightly browned, 3 to 4 minutes.
Transfer the chicken to a platter or individual serving plates and spoon the pan drippings over it.