Add the venison, pork, vinegar, garlic powder, onion powder, thyme, fennel, nutmeg, allspice, salt, and pepper, to a food processor, or a large bowl. A food processor is best if you have one.
Process or mix everything together well for about 20-30 seconds until the mixture is relatively smooth. Shape the sausage mixture into patties, using about 2-3 tablespoons per patty.
To cook the sausages, heat a skillet over medium heat. When it’s hot, add the oil/butter. Fry the patties for about 5 minutes per side, or until the sausage is cooked through and browned all over.
Serve them immediately, or cool the sausages and freeze them on a parchment-lined baking sheet. Transfer the frozen patties to a zip-top freezer bag or container and they’ll keep for about 3 months.
When you’re ready to heat them, microwave for 30-second intervals until hot or cook on the stovetop in a skillet.