Cuban Garlic Chicken

This is straight from Havana, from a restaurant called "Gladys' House". Adapted from a recipe printed in the Chicago Tribune. You can find bottled sour orange juice in Hispanic markets or well-stocked Hispanic aisles in your local grocery store. Cook/prepare time includes marination time of one hour.

Ingredients:
6 -8 lbs whole chickens (2 3-4 lb. chicken, cut into pieces)
12 garlic cloves, coarsely chopped
1 cup sour orange juice (or 1/2 cup orange juice mixed with 1/2 cup lime juice)
1 tablespoon salt
1 tablespoon white vinegar
1 teaspoon fresh ground pepper
1 teaspoon dried oregano
1 teaspoon ground cumin

Directions:
Place the chicken in a container large enough to hold all the pieces (I used an extra-large zip-loc bag).
Combine the garlic, sour orange juice, salt, vinegar, pepper, oregano and cumin in a small bowl. pour the marinade evenly over the chicken; cover chicken (or close bag and smush it around); refrigerate at least 1 hour or overnight.
Heat oven to 450°. Arrange chicken in one layer in a roasting pan; pour the marinade evenly over the top of the chicken.
Roast the chicken in the lower third of the oven, stirring during the last 10 minutes to coat with the sauce, until it is cooked through and the sauce begins to caramelize, 45 minutes to 1 hour.
Remove the chicken to a platter, spoon garlic sauce over the pieces.