Cut the 3 lb espaldilla de cerdo (Boston butt) cortada en cubos de 1 pulgada, mantener muy fría and 1 lb grasa de lomo de cerdo cortada en cubos de 1 pulgada, mantener muy fría into 1-inch cubes. Spread them on a Baking Sheet and place in the Ziploc Bag (Pint Size) for 30–45 minutes until very firm but not frozen solid. Cold meat is critical — it grinds cleanly and prevents fat smearing, which ruins the texture.

While the meat chills, combine all spice mix ingredients in a small Mixing Bowl and stir to blend. Set aside. Also soak your 8 oz tripas de cerdo (32–35mm) remojadas en agua tibia durante al menos 1 hora, enjuagadas por dentro y por fuera in a Mixing Bowl of lukewarm ¼ cup agua helada. Flush ¼ cup agua helada through the inside of the casings by running one end over the faucet. Let them soak at least 1 hour.

Set up your Meat Grinder with the coarse grinding plate (3/8-inch or 10mm). Grind the chilled 3 lb espaldilla de cerdo (Boston butt) cortada en cubos de 1 pulgada, mantener muy fría and 1 lb grasa de lomo de cerdo cortada en cubos de 1 pulgada, mantener muy fría together into a large Mixing Bowl set over a Mixing Bowl of ¼ cup agua helada to keep everything cold throughout the process.

Sprinkle the spice mix evenly over the ground meat. Add the ¼ cup agua helada. Using your hands (wear gloves if preferred), mix vigorously for 2–3 minutes until the mixture becomes slightly sticky and the fat is well incorporated — this develops the protein bind that gives sausage its firm, cohesive texture.

Optional but recommended: Pass the seasoned mixture through the Meat Grinder a second time using the fine plate (3/16-inch or 5mm) for a smoother, more uniform texture. Keep everything cold throughout.

Pinch off a small patty of the sausage mixture (about 1 tbsp) and cook it in a small Skillet over medium heat until cooked through. Taste and adjust seasoning — more 1 tbsp sal kosher, 1 tbsp sal kosher, or spice — before stuffing. This is your only chance to correct the flavor.

Attach the sausage stuffing tube to your Meat Grinder or stuffer. Slide a soaked 8 oz tripas de cerdo (32–35mm) remojadas en agua tibia durante al menos 1 hora, enjuagadas por dentro y por fuera onto the tube, leaving a 3-inch tail hanging off the end. Do not tie the end yet.

Feed the sausage mixture into the stuffer and begin filling the casing at a steady, even pace. Fill firmly but not too tightly — overstuffed casings will burst during smoking. Guide the casing with your free hand to control tension and avoid air pockets.

Once fully stuffed, twist the sausage coil into individual links: pinch the rope firmly at 5–6 inch intervals, then twist each link in alternating directions (first link forward 4–5 turns, next link backward 4–5 turns) to lock them in place. Tie off the ends with butcher's Kitchen Twine. Prick any visible air bubbles with a sausage pricker or toothpick.

Place the linked sausages uncovered on a Wire Rack set over a Baking Sheet. Refrigerate for at least 2 hours, or overnight. This drying step (called pellicle formation) allows the surface to dry slightly so smoke adheres better and the casing sets up properly.

Prepare your Smoker. Set it to 130°F with no smoke for the first 30 minutes to continue drying the surface. Use 3 cups astillas o trozos de madera dura hickory, manzana o cerezo — remojados en agua 30 minutos si se usan astillas or chunks hickory, apple, or cherry wood chips or chunks.

Hang the sausage links from smoke sticks or lay them on Smoker racks, making sure they are not touching each other. Airflow around each link is essential for even smoking and casing development.

After the initial 30-minute no-smoke period, introduce your wood and increase the Smoker temperature to 160°F. Smoke for 1 hour.

Increase the Smoker temperature to 180°F and continue smoking for another 60–90 minutes, until the internal temperature of the sausages reaches 155°F on an Meat Thermometer. The casings should be a deep mahogany color and feel firm to the touch.

Once the sausages hit 155°F internally, remove them from the Smoker and immediately submerge in an ¼ cup agua helada bath for 10–15 minutes. This 'cold shocking' step stops the cooking, sets the casing tight, and gives the sausages their signature snap.

Remove from the ¼ cup agua helada bath and pat dry with paper towels. Allow the sausages to bloom at room temperature for 30–60 minutes — the color will deepen to a beautiful reddish-brown. Serve immediately, refrigerate for up to 5 days, or freeze for up to 3 months.