Pork Loin Stuffed with Walnuts

Preparation

1. 1.Season the pork only with salt, pepper, a clove of garlic (which is removed), and a splash of white wine.
2. 2.In a large pot, sauté the onion, then the carrot, then the mushrooms and then add the rest sometimes? (Hard to read...).
3. 3.I don't put the beef broth in the stuffing; it's for basting the meat when it goes into the oven.
4. 4.Open the meat in half, without separating. Press the meat firmly, tie with kitchen twine. If there's leftover stuffing, I can put it on the outside. Baste it repeatedly and let it roast, but not too much.