This pork tenderloin is finished with a sweetened spicy mustard sauce with a little bit of crumbled rosemary. The pork is roasted with a simple mustard rub and then it is served with the rosemary and mustard sauce. Due to the low-fat content in pork tenderloin, it can become dry if overcooked. The safe minimum temperature for pork is 145 f/63 c. We recommend checking the pork after about 20 minutes with a thermometer inserted into the thickest part of the tenderloin. Slice the pork tenderloins, drizzle with sauce, and serve with potatoes and your family's favorite vegetables.