Remove the 1 pavo completo 12–14 lb from the refrigerator 1 hour before roasting to take the chill off — this helps it cook more evenly. Pat the 1 pavo completo 12–14 lb completely dry inside and out with paper towels. Dry skin is the key to getting it golden and crispy.

Preheat your oven to 325°F. Position a rack in the lowest third of the oven.

In a small mixing bowl, combine the softened mantequilla sin sal ablandada a temperatura ambiente, minced dientes de ajo, 2 tbsp romero fresco finamente picado, 6 ramitas de tomillo, 2 tbsp salvia fresca finamente picada, 1 tbsp perejil fresco de hoja plana finamente picado, 1 tsp cáscara de limón (if using), 1 tbsp sal kosher, and 1 ½ tsp pimienta negra. Mix together with a fork or spatula until fully combined and smooth.

Rub the outside of the pavo completo 12–14 lb all over with 2 tbsp aceite de oliva, then season generously with 1 tbsp sal kosher and 1 ½ tsp pimienta negra, including the underside and inside the cavity.

Gently loosen the skin over the 1 pavo completo 12–14 lb breast and thighs by sliding your fingers carefully underneath, being careful not to tear it. Push about two-thirds of the herb 8 tbsp mantequilla sin sal ablandada a temperatura ambiente under the skin, pressing from the outside to spread it evenly over the breast and thigh meat. Rub the remaining herb 8 tbsp mantequilla sin sal ablandada a temperatura ambiente all over the outside of the skin.

Stuff the cavity loosely with the aromatics: quartered 1 cebolla amarilla, halved 1 limón, halved 4 dientes de ajo, 4 tallos de apio, 2 tbsp romero fresco finamente picado sprigs, and 6 ramitas de tomillo sprigs. Do not pack tightly — the aromatics are for flavor, not stuffing. Tie the legs together with kitchen twine and tuck the wing tips under the body.

Scatter the chopped zanahorias aproximadamente picadas, 4 tallos de apio, and 1 cebolla amarilla in the bottom of a large roasting pan. Place a roasting rack on top of the vegetables. Set the 1 pavo completo 12–14 lb breast-side UP on the rack. Pour the 2 cups caldo de pollo o pavo bajo en sodio into the bottom of the pan — this keeps the drippings from burning and creates the base for a great gravy.

Roast the 1 pavo completo 12–14 lb at 325°F. As a general guide, a 12–14 lb pavo completo 12–14 lb takes about 3 to 3.5 hours. After the first 2 hours, check the 1 pavo completo 12–14 lb. If the skin is already deep golden, tent it loosely with aluminum foil to prevent over-browning, but leave it uncovered for the last 30 minutes to re-crisp.

Baste the 1 pavo completo 12–14 lb every 45–60 minutes by spooning the pan drippings over the skin. This adds flavor and promotes even browning. Do not baste more frequently than this, as opening the oven lowers the temperature.

The 1 pavo completo 12–14 lb is done when a meat thermometer inserted into the thickest part of the thigh (without touching bone) reads 165°F. The breast should also read at least 160°F. Do not rely on the pop-up timer alone — always use an instant-read meat thermometer for accuracy.

Remove the 1 pavo completo 12–14 lb from the oven and transfer it to a cutting board. Tent loosely with aluminum foil and let it rest for at least 30 minutes before carving — this is non-negotiable. Resting allows the juices to redistribute throughout the meat. Carve and serve immediately.