Season the beef eye tenderloin generously with salt and pepper.
Heat the olive oil in a large frying pan over high heat.
Sear the beef tenderloin on all sides until well-browned (about 2 minutes per side).
Remove the beef from the pan and brush it with Dijon mustard. Set it aside to cool.
Make the Duxelles:
In the same pan, melt the butter over medium heat.
Add the chopped mushrooms, shallots, garlic, and thyme. Sauté until the mushrooms release their moisture and the mixture becomes dry (about 10 minutes).
Stir in the parsley and season with salt and pepper. Remove from heat and let it cool.
Assemble the Wellington:
Lay out a sheet of cling film on a clean surface. Arrange the prosciutto slices on the cling film, overlapping them slightly.
Spread the duxelles mixture evenly over the prosciutto.
If using pâté, spread it over the beef tenderloin.
Place the beef tenderloin on top of the duxelles-covered prosciutto.
Use the cling film to wrap the prosciutto tightly around the beef, forming a log. Chill in the refrigerator for 20 minutes.
Wrap in Puff Pastry:
Roll out the puff pastry on a lightly floured surface into a rectangle large enough to enclose the beef tenderloin.
Remove the cling film from the beef tenderloin and place it in the centre of the puff pastry.
Fold the pastry over the beef, sealing the edges with a bit of water.
Trim any excess pastry and press the edges to seal tightly. Brush the entire pastry with the beaten egg.
Bake:
Place the wrapped beef Wellington on a baking tray lined with baking paper.
Bake in the preheated oven for 30-35 minutes, or until the pastry is golden brown and crisp.
Use a meat thermometer to ensure the internal temperature reaches around 55°C for medium-rare. Adjust baking time if needed.
Serve:
Allow the Wellington to rest for 15 minutes before slicing. Serve with your choice of sides, such as roasted vegetables or mashed potatoes.
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Melbourne orders have been deactivated as Manettas are currently in the process of changing suppliers. Keep an eye on this space for further updates