Preheat oven at 375º
Rub the pork tenderloins all over well with salt and pepper. Sauté pork tenderloins on a heavy bottom pan with high borders - I use Le Creuset pot - with olive oil until all sides are nicely browned.
Mix together the heavy cream and mustard in a bowl. Add to the pork.
Place pan in the hot oven and cook for 45 minutes covered. Turn occasionally.