Whole roasted suckling pig for Christmas Eve is an extravagant Mexican holiday tradition. This high protein, carnivore, family celebration dish is a fresh, impressive festive centerpiece.
Preheat your oven to 350°F, and place a rack in the lower third position to accommodate the pig's size.
Rub the suckling pig thoroughly inside and out with kosher salt, black pepper, and olive oil for even seasoning and crisp skin.
Slice the oranges and stuff them, along with the garlic cloves, thyme sprigs, and bay leaves, into the pig's cavity for bright, aromatic flavor.
Truss the legs using kitchen twine, lay the pig belly-side down on a large roasting rack set in a sturdy roasting pan, and tent loosely with foil to retain moisture during the initial roast.
Roast for 3 hours, then remove the foil, baste with the pan drippings, and increase oven temperature to 400°F; continue roasting until the skin is deeply golden and crackling, about 1.5–2 hours more, basting every 30 minutes.
Let the lechón rest uncovered for 30 minutes before carving to preserve juiciness and make the crackling easier to cut.