Pork Fillet with Mushrooms and Potatoes

"One-Pot Pork Fillet with mushrooms and potatoes is a french tenderloin dish. The pork filet is seasoned and cooked with mushrooms and potatoes in one large pot or in a casserole dish in the oven. This is your dish if you want to prepare something special for lunch on a weekend but with the least amount of work effort involved. I love the simple flavors in this dish as it reminds me of the french countryside and my grandmother's kitchen. One tenderloin can feed a large family of 6 and more and the number of mushrooms and potatoes can be adjusted easily to your needs."