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squirt yellow mustard on the pork butt, then cover it with Dizzy Dust. Rub it all together to make kind of a paste and then cover it with saran wrap. I typically leave it in the fridge overnight, but I've had good experiences just putting it straight on the Egg.
I've tried Dizzy Dust, a Hawaiian sea salt rub, and I tried to make my own. For me, Dizzy Dust destroyed the competition.