Cover roast with sea salt (about 1% by weight). Place it on a half sheet pan with a wire rack and put it uncovered in the fridge overnight.
Coat roast lightly with oil. Season generously with Dad Dust, brisket pepper, and Herbes de Provence.
Tie roast with butcher’s twine to hold its shape.
Fill the Woodfire with smokin pecan pellets and set Woodfire to the SMOKER setting, 180°F (82°C) and 3 Hours. If you have the connected version insert a probe and set the Woodfire up as a Thermometer Cook, Manual, 120°F (49°C). Keep the roast on the sheet pan, so it can catch the drippings, and place it in the woodfire to smoke.
When the roast reaches an internal temp of 120°F (49°C) remove it and then remove strings. Set the Woodfire to GRILL HI and allow it to preheat fully, about 10 minutes. Add the beef tallow to the grill plate and sear the roast on all sides until crust develops (about 4 minutes).
Tent with foil and rest while cooking the other parts of the dinner.