Pork Tenderloin with Mustard Sauce

Name: Pork Tenderloin with Mustard Sauce
Prep time: 10 min
Cook time: 30 min
Total time: 30 min
Yield: 4 portions
Ingredients: 16 oz pork tenderloin; 3 ½ oz button mushrooms; 2 ½ oz dry vermouth; 3 ½ oz whole milk; 2 oz yellow onions; 2 tsp whole grain mustard; 1 tsp hot mustard; 1 chicken stock cube; 1 tsp salt; 1 pinch ground black pepper; 2 tbsp crème fraîche; 1 heaping tbsp corn starch; 2 - 3 sprigs fresh parsley