Sauté some chopped onions in the same skillet you browned the pork roast in. When the onions are soft, add some cumin, coriander, and crushed red pepper flakes.
Pour in some red wine that's on the dry side - a red blend or cabernet is a good choice. The main thing is that the wine is tasty enough to drink all on its own.
When the roast is cooked through, remove it to a platter and allow the cherry sauce to simmer on the stovetop for a few minutes, just until it thickens up a bit.