Clean your meat of any silver skin, sinew, arteries and cut into small cubes. Place the meat and fat in the freezer for an hour
Grind chilled pork, fat, and beef through 4.5mm plate.
Mix all ingredients with cold meat till very tacky
Stuff firmly into 40mm-43mm beef rounds
Ferment at 26C (80F) for 18 hours, 90-85% humidity till pH reads 4.6 - 4.8 (the lower it goes the tangier your pepperoni will taste).
OPTIONAL: After fermentation lightly cold smoke the pepperoni for 2 hours
Place pepperoni in a drying chamber set to 12C - 13C (55F) and 80% humidity. Dry for 4-10 days. (You are looking for a 20% weight loss)
Once dried slowly cook your pepperoni till the internal temp reaches 57C - 63C (135-145F). you can either do this by smoking or sous vide. For sous vide Cook at 60C (140F) for 2 hours