Spicy pork mulas at Tacos El Gordo, 3049 S. Las Vegas Blvd, Las Vegas, NV 89109 (near Circus Circus).
You can thank me after you've had them. Last time I was there I discovered them, and I went back 5 times in 3 days.
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Thanks Dave, Julian, James, Kelly, Peter, Gerry, Dave, Mo, Frank, Týr and Mr. Mark!