Preheat oven to 350 degrees Fahrenheit (180 degrees Celsius).

Combine all rub ingredients in a bowl.

Smear the entire roast with olive oil. Spread the spice rub over the top and bottom of the meat.

In a large grill pan over medium-high heat, sear the roast for five minutes on each side. Place in a 9 x 13-inch (20- by 30-centimeter) baking pan.

Combine ingredients for the glaze and spread over the meat. Bake on the center rack of your oven, uncovered, for 45 minutes.

Remove the meat from the oven and lower the heat to 225 degrees Fahrenheit (105 degrees Celsius).

Transfer the meat to a large piece of parchment paper. Wrap the meat in the parchment paper, then seal it with aluminum foil.

Return the wrapped meat to the baking pan. Tightly seal the pan with aluminum foil and bake overnight for 16 hours. Alternately, you can raise the oven to 325 degrees Fahrenheit (170 degrees Celsius) and bake the meat for just four hours.

Allow to cool before slicing.