Stovetop Pork in Balsamic Vinegar

This is my friend Lisa’s recipe. Everybody loves it when she makes it and they always say, ‘There’s hardly enough left for panini tomorrow!’ And it’s true, the leftovers and sauce stuffed into a panino the next day are exceptional. After the long cooking the pork is so tender that it’s served more in pieces than slices. I love it with Salt & pepper potatoes with a trickle of buttermil