Beef Wellington (Ben) Metric

Name: Beef Wellington (Ben) Metric
Prep time: 30 min
Cook time: 10 h 10 min
Total time: 10 h 10 min
Yield: 8 portions
Ingredients: 795 g beef tenderloin; 100 g extra virgin olive oil; 60 g Dijon mustard; 2 garlic cloves; 45 g shallot; 395 g brown mushrooms, fresh; 200 g button mushrooms; 1 tsp salt; ¼ tsp black pepper, ground; 5 sprigs thyme, fresh; 8 slices prosciutto; 2 sheets puff pastry; 2 egg yolks; 1 tsp fleur de sel; 30 g olive oil; 30 g butter, unsalted; 200 g beef tenderloin; 12 black peppercorns; 1 bay leaf, dried; 3 sprigs thyme, fresh; 755 g red wine; 2 tsp red wine vinegar; 500 g beef broth; ½ tsp salt; 2 tbsp cornstarch