In a large non-stick skillet, melt the butter. Add the chopped shallots. Cook shallots for about 3-4 minutes, until softened. Add the orange juice, orange zest, red wine, and sugar to the pan. Mix well; continue cooking on low heat until sugar dissolves. Add the cranberries and raspberries to the pan. Cook over medium heat until sauce reduces and thickens (about 20 minutes). Stir sauce occasionally.
When roast is done and has "rested", slice into serving portions, place meat on serving platter, and spoon the warm sauce over the top of the pork slices. Garnish with fresh parsley, if desired. Enjoy!
Note that the lengthy prep time is not "Active" prep time. The length is to allow the pork marinating time.
Also remember to adjust down the cooking time if you are using a smaller pork tenderloin. Smaller tenderloins will cook in 20-25 minutes. Just gauge by the internal temperature of the pork.
Pork Tenderloin with Cranberry-Raspberry Sauce https://www.thegratefulgirlcooks.com/pork-tenderloin/