Place the duck on a rack in a roasting pan. Rub the crushed garlic and pepper under the skin of the duck. Rub the skin with 1 packet sazon seasoning.
Roast 3 hours in the preheated oven, to an internal temperature of 180 degrees F (80 degrees) C.
Place the reserved duck innards and 1 packet sazon seasoning in a saucepan with enough water to cover. Bring to a boil, reduce heat, and simmer 30 minutes, until tender.
Place the rice mix in a medium saucepan with just enough water to cover. Mix in the oil, and 1 packet sazon seasoning. Bring to a boil. Reduce heat, cover, and simmer 25 minutes, stirring occasionally.
In a bowl, mix the cooked innards, cooked rice, and croutons. Stuff the cooked duck with the mixture to serve.
