Rub the beef base and Worcestershire sauce into the ribs on both sides.
Apply a salt-and-pepper-based rub evenly over the meaty side.
Apply a beef rub, then an umami-based rub.
Allow the ribs to set in the fridge for 3 hours or up to overnight.
Preheat your smoker to 300°F (149°C) using your Smoke X and Billows BBQ control fan. Put your ribs on the smoker, probe them, and set the high-temp alarm on the ribs for 150°F (66°C). Wad up two balls of foil and place one under one side of each rack of ribs to allow for runoff.
Smoke the ribs until the high-temp alarm sounds. It should take a few hours.
Check the bark of the ribs by scratching the surface to see if any rub comes off.
Create two foil wraps large enough for a slab of short ribs.
Lay one slab on a wrap and apply a little more beef rub.
Sprinkle the ribs with about 1/4 C brown sugar. Sprinkle with 1–2 tsp cayenne.
Pour on half the melted butter and half the can of cola.
Wrap the ribs back up and put them back on the smoker. Repeat with the other rack of ribs.
Reset the high-temp alarm for the meat channels to 203°F (95°C).
When the high-temp alarm sounds, verify the temp with your Thermapen ONE. If you see nothing below 203°F (95°C) and the meat feels tender, remove it from the smoker. Allow the ribs to rest, wrapped, for at least a half hour before opening.
Open the wrap, slice the ribs, and dig in!