2. Cut the chickens in half along the breast bone. Trim and discard the backs and all the fat. (You can ask the butcher to prepare the chickens.) With a paring knife, make a slit in the skin near each thigh and insert a piece of garlic. Sprinkle all over with the salt, pepper, and the rosemary.
3. In a large skillet, heat the oil over high heat. (The oil should be 1/2-inch deep so adjust accordingly.) When the oil is very hot, add the chicken, 2 pieces at a time, skin-side-down. Top the chicken with a pan, fill with weights and cook until the skin is golden brown, about 7 minutes. Turn over, top with weights again, and cook another 7 minutes longer.
4. Transfer the chicken to a baking sheet, skin-side-up, and bake an additional 20 minutes. Serve hot.
Note: To catch splattering oil, line the floor near the stove with newspapers. You will need about 30 pounds of weights (stones, bricks or canned goods) for this dish.