Flatten pork rounds to ½ inch thickness and season with salt and pepper to taste. Heat butter or olive oil in skillet and sauté tenderloin rounds approximately 2 minutes per side or until browned. Transfer to plate. Add in shallots and sauté for 1 minute. Add sauce and heavy cream and proceed to boil until sauce thickens enough to coat a spoon. Mix in capers and mustard, and return tenderloins to sauce in skillet to heat through.