Ingredients:

1.5kg (3.3lb) center-cut beef tenderloin
2 tbsp olive oil
Salt and pepper to taste
500g (1lb) mushrooms, finely chopped
2 tbsp unsalted butter
2 shallots, finely chopped
2 garlic cloves, minced
2 tbsp Dijon mustard
6 slices prosciutto
1 sheet puff pastry
1 egg, beaten
Instructions:

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