Preheat oven to 400 degrees F.
Stir together cumin, coriander, pepper, cinnamon, garlic and salt and pepper in a bowl. Pat pork roast dry and rub spice mixture all over the pork until evenly coated.
Place the pork in a roasting pan and roast at 400 degrees for 35 minutes. After 35 minutes, turn the pork over, and allow to roast for an additional 30 minutes, or until an internal temperature reaches between 145-150 degrees. Take out of the oven and allow to rest for at least 15 minutes. Start on the sauce.
In a medium sauce pan, add pomegranate juice and gently boil over moderately high heat until reduced to about ⅔ cup, about 3 minutes. In a measuring glass, dissolve the 2 teaspoons of cornstarch with the wine, and whisk until no clumps remain. Add the brown sugar and wine slurry to the pomegranate juice. Simmer for a few minutes. Add the butter, until dissolved and season to taste with salt and pepper. Serve the warm pomegranate sauce over the carved pork slices. ENJOY!