Preheat the oven to 350°.
Place all ingredients for glaze into a small, non-reactive bowl or jar and whisk to combine. Season to taste with salt & pepper.
For the pork, slice the tenderloin(s) into 1-inch thick medallions. Season both sides with salt and pepper.
Coat the bottom of a medium skillet with a light film of oil and heat over medium-high heat until hot.
Add the pork slices in one layer and sear for about 1 -2 minutes. Turn and sear for 1 more minute or so, until lightly browned.
Transfer the slices in 1 layer to a shallow baking dish or keep in the skillet if oven proof, pour the glaze over and bake.
Pour the glaze over the slices and turn them to coat.
Roast for 8-12 minutes, or until cooked through and just barely pink in the middle.
Remove from the oven and keep warm, loosely covered until ready to serve.
To serve, place medallions on a platter and spoon some of the glaze over them. Garnish with sprigs of fresh rosemary.
