Heat the oil in a large dutch oven or cast iron skillet over medium heat.
Season the pork with salt and pepper and place in your heated pan. Cook 2 minutes on each side. Remove the pork and place on a plate.
In the same skillet combine the peaches, onion, and balsamic. Stir and cook for one minute. Place the pork on top of the peach mixture and put into the oven.