Use a spice grinder or mortar and pestle to finely grind the peppercorns and fennel seeds.
Mix with brown sugar, salt, granulated garlic, dry mustard and red pepper flakes.
Sprinkle over ground venison and mix well.
Divide into 3 portions on a sheet pan.
Roll each portion into a 1 1/2 inch around log.
Sprinkle coarse ground pepper onto sheet pan on one side of a log.
Roll back and forth through the pepper until outside of log is completely coated. Repeat with each roll.
Wrap each log in foil, sealing the ends.
Place over indirect heat on a 250° grill. Close the lid and cook for 30 minutes using hickory wood for smoke flavor.
Remove from grill and carefully unwrap from foil. Return pepperoni to the grill and continue to cook another 30 minutes or until desired smoke level is reached.
Cook until internal temperature is at least 165° to be cooked through. After cooking for 1 hour, our sausage was at about 190°.
Remove from grill. Cool and wrap tightly with 2 layers of plastic wrap, refrigerate until ready to serve.