Remove chuck roast from refrigerator one hour before smoking.
Prepare your smoker (or set up your grill for smoking) and preheat it to 250°F. I like to use hickory pellets for this as they compliment beef very well.
Sprinkle grilling seasoning all over roast, coating all sides. Place roast onto grates of smoker, close the lid, and smoke for roughly 3 hours, checking it halfway through, until it reaches an internal temperature of 160-170°F. The time will depend on the size of your roast. You'll be looking for the fat on the roast to have turned a yellowish color. This is when you know it's ready to be wrapped.
Remove the roast from the smoker and set it on a large sheet of aluminum foil or butcher paper. Wrap the roast tightly and place it back on the grill grate. Smoke for another hour, or until the temp reaches at least 200°F. The thermometer should easily go through the foil (or paper) and into the roast with no resistance.
Unwrap the roast and allow it to sit for at least 15 minutes, or up to 30 minutes. This will make it easier to cut into cubes (otherwise it will just fall apart).
Cut roast into 1-inch cubes and place cubes in a disposable aluminum pan. Add slices of butter, barbeque sauce, brown sugar, and another sprinkling (or two) of the grilling seasoning. Toss everything together and place back on the smoker for an additional hour, uncovered.
Remove from the smoker, toss again to distribute the sauce, and serve. PERFECTION!!!
Notes
Store any leftover burnt ends in an airtight container and refrigerate for 3-4 days or freeze for up to 3 months. They can also be made in advance of serving.To reheat, cover and place in a 350-degree oven for 20-25 minutes, or until warmed through. Can be served as is or on a gluten free bun for a burnt ends sandwich!If you don't have a smoker, you can still set up your grill like a smoker. There are many options, such as using a smoker box or adding soaked wood chips to a foil packet or directly on top of charcoal. Google it for more details.