Prepare the Spice Mix: In a large bowl, mix the plain salt, white sugar, black pepper, mustard seed, garlic powder, cayenne pepper, and pink curing salt.
Grind the Meat: Using a cold meat grinder, grind the venison and pork belly together. It helps if the meat is semi-frozen to ensure a clean grind.
Mix Meat with Spices: In a large container, combine the ground meat with the spice mixture, non-fat dry milk, and ice-cold water. Mix thoroughly by hand or mixer for 10–15 minutes until sticky and tacky.
Refrigerate Overnight: Cover and refrigerate the seasoned meat mix overnight to allow curing to take effect.
Add Citric Acid & Stuff: The next day, mix in the encapsulated citric acid right before stuffing. Stuff the mixture into pre-soaked fibrous casings.
Dry the Sausages: Hang sausages at room temperature or in a cool, dry place for about 1 hour until casings feel dry to the touch.
Smoking Process: Begin by smoking the sausages at 130–140°F for 2 hours to allow the smoke flavor to develop gradually. Then, increase the temperature to 150°F and continue smoking for another 2 hours. Finally, raise the temperature to 180°F and cook the sausages until they reach an internal temperature of 155°F to ensure they are fully cooked and safe to eat.
Cool the Sausages: Submerge in an ice bath for 10–15 minutes to stop cooking and firm up the texture. Hang again to dry before refrigerating.