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Trim brisket of excess fat and apply mustard all over as a binder.
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Season generously with a pepper-forward brisket rub and refrigerate for 1-2 hours.
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Smoke on pellet smoker at 210 degrees with hickory pellets, water pan underneath, for 9-10 hours until 165-170 degrees.
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Wrap in butcher’s paper with apple cider vinegar and beef tallow, then smoke at 250 degrees until 204-206 degrees.
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Rest wrapped brisket in cooler for 2-3 hours.
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Sauté diced onions with avocado oil, kosher salt, and butter until caramelized.
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Assemble melt with sourdough bread, fried onions, Colby jack cheese, brisket slices, caramelized onions, BBQ sauce, provolone cheese, and top bun.
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Toast in cast iron skillet with butter for 3-4 minutes, flipping once.