Cordero al Asador — Patagonian Butterflied Lamb on a Cross-Stake

Begin by cleaning the 20 to 25 lb butterflied lamb, removing any excess loose fat but keeping the surface fat intact to protect the meat. Prepare the 'salmuera' (basting brine) by mixing 0.5 cup coarse salt into 1 cup warm water until dissolved, then whisking in 0.25 cup vegetable oil, 10 cloves of minced garlic, 1 tbsp dried oregano, and 1 tbsp ground cumin. This solution serves as both the primary seasoning and a hydrating lacquer that prevents the surface from drying during the long exposure to open-air heat.

Spread the butterflied lamb flat on the iron cross-stake, ensuring the rib cage is facing toward what will be the fire. Use the cross-members and adjustable wires to secure the legs and spine tightly so the meat does not slip as it relaxes during the cook. If using a smoker or grill instead, prepare it for indirect cooking by establishing a two-zone setup, targeting an ambient temperature of 275°F using oak for that traditional robust smoke profile.

Position the lamb approximately 3 feet from the fire at a 45-degree angle (or place it bone-side down on the grill grate). This phase focuses on heating the bones, which act as conductors to cook the meat from the inside out. Maintain your fire or smoker at 275°F. Monitor the meat closely during these first two hours to ensure the surface temperature doesn't rise too quickly, keeping it out of the 40-140°F danger zone efficiently while building a foundation of smoke.

Every 30 to 45 minutes, generously apply the garlic-cumin salmuera using a brush or a bundle of herbs. Shake the mixture before each application to ensure the oil and spices haven't settled. If using the cross method, rotate the stake 180 degrees if one side is coloring faster than the other. On a grill, rotate the meat to ensure the areas closest to the heat source are swapped. The goal is a steady, rhythmic application of moisture and salt to build a deeply flavored crust.

Once the bone side is well-colored and the internal temperature reaches approximately 150°F, flip the lamb to face the meat-side towards the heat. Continue basting with the remaining salmuera. Watch for the fat to begin rendering and bubbling. You are looking for a deep mahogany color and charred spots where the fat has 'fried' on the surface. Continue cooking until the thickest part of the shoulder reaches an internal temperature of 170°F to 180°F, which ensures the collagen in these hard-working muscles has fully melted.

Remove the lamb from the cross or grill and place it on a large carving board or a clean, insulated surface. Cover loosely with foil—do not wrap it tightly, as you don't want to steam off the crisp skin you've worked to create. Let the meat rest for at least 20 to 30 minutes. During this time, carry-over cooking will finish the center, and the internal juices will redistribute from the center back toward the surface fibers, ensuring every bite is succulent.

Carve the lamb by first separating the limbs and then slicing the meat against the grain. Ensure every guest receives a mix of the crispy exterior bark and the tender, juicy interior meat. Serve with any remaining juices from the carving board drizzled over the top. The meat should pull easily from the bone but still retain enough structure to be sliced cleanly. Offer traditional chimichurri on the side to provide an acidic counterpoint to the rich, smoky lamb fat.