Add all the ingredients of the spice rub to a small food processor and process until it turns into a thick paste.
Cover the roast with the spice rub (make sure to push it down any crack that your roast may have) then place it in a shallow baking dish, cover with plastic wrap and place it in the refrigerator for a few hours or better yet, overnight.
Preheat your oven to 325°F
Remove the plastic that covers your roast and replace it with aluminum foil.
Place your roast in the oven and cook it for an hour, then remove the foil and continue cooking for an additional 30 minutes, basting once or twice.
Remove the cooked roast from the oven and let it cool for a few hours, then transfer it to the refrigerator to chill completely, at least 4 hours but preferably overnight.
Slice as thinly as possible and serve cold.
Notes
*You could also eat this warm as it comes out of of the oven, if you wanted to. It's also delicious, trust me!