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Keto Beef Wellington with Mushroom Duxelles: A Low-Carb Twist on a Classic Dish

Beef Wellington is often regarded as a show-stopping dish, perfect for special occasions and festive gatherings. Traditionally consisting of a succulent beef fillet enveloped in a flaky pastry, this delicacy typically falls outside the realm of ketogenic diets, which prioritise low-carb, high-fat foods. However, with a few clever substitutions, it’s entirely possible to enjoy this classic dish while adhering to a keto lifestyle. This article will guide you through the process of making Keto Beef Wellington with Mushroom Duxelles, ensuring you can savour every mouthful without compromising your dietary goals.

Ingredients

For the Beef Wellington:

• 1.5 kg centre-cut beef fillet (preferably grass-fed)
• Salt and freshly ground black pepper, to taste
• 2 tbsp olive oil
• 1 tbsp Dijon mustard
• 200 g prosciutto or bacon, thinly sliced
• 1 head of cauli-rice (or 1 pack pre-packaged)
• 1 tbsp butter, for frying

For the Mushroom Duxelles:

• 400 g mixed mushrooms (shiitake, button, and portobello work well)
• 1 small shallot, finely chopped
• 2 cloves garlic, minced
• 2 tbsp fresh thyme leaves, chopped (or 1 tbsp dried thyme)
• 1 tbsp balsamic vinegar (optional)
• Salt and freshly ground black pepper, to taste

For the Keto Pastry (Almond Flour Version):

• 200 g almond flour
• 50 g coconut flour
• 1/2 tsp salt
• 150 g cold butter, cubed
• 1 large egg (for egg wash)
• 3-4 tbsp cold water

Instructions

Step 1: Prepare the Mushroom Duxelles

1. Chop the Mushrooms: Finely chop the mixed mushrooms until they resemble a coarse paste. A food processor can be handy for this step.
2. Cook the Mixture: In a frying pan, melt the butter over medium heat, then add the shallots and garlic. Sauté until fragrant and translucent.
3. Add Mushrooms and Season: Add the chopped mushrooms to the pan, along with the thyme, balsamic vinegar (if using), salt, and pepper. Cook until the mixture is dry and caramelised, stirring frequently—about 10-15 minutes. Once cooked, set aside to cool.

Step 2: Brown the Beef Fillet

1. Season the Beef: Generously season the beef fillet with salt and pepper.
2. Sear the Fillet: Heat the olive oil in a large, oven-safe frying pan over high heat. Once hot, sear the beef fillet on all sides until it’s browned. This should take about 2-3 minutes per side.
3. Coat with Mustard: Remove the fillet from the heat and brush it with Dijon mustard while it’s still warm. Allow it to cool completely.

Step 3: Prepare the Keto Pastry

1. Mix the Flours: In a large bowl, combine almond flour, coconut flour, and salt.
2. Add Butter: Using your fingers or a pastry cutter, rub in the cold butter until the mixture resembles breadcrumbs.
3. Form the Dough: Add cold water, a tablespoon at a time, mixing until a dough forms. Wrap in cling film and refrigerate for at least 30 minutes.

Step 4: Assemble the Wellington

1. Lay Out the Prosciutto: On a large sheet of baking parchment, lay out the prosciutto slices to form a rectangle, slightly overlapping them.
2. Spread the Duxelles: Once cooled, spread the mushroom duxelles evenly over the prosciutto.
3. Add the Beef: Place the cooled beef fillet at one end of the prosciutto-lined parchment and roll it tightly, using the parchment to help you form a log. Twist the ends of the parchment to seal it. Chill in the refrigerator for another 15 minutes.

Step 5: Wrap in Pastry

1. Roll Out the Pastry: On a slightly floured surface, roll out the chilled dough into a rectangle large enough to completely wrap the beef.
2. Wrap the Wellington: Remove the beef roll from the fridge, unwrap it, and lay it in the centre of the pastry. Wrap the pastry tightly around the beef and tuck the edges under to seal. Beat the egg and brush it over the pastry for a golden finish.

Step 6: Bake

1. Preheat the Oven: Preheat your oven to 200°C (fan) or 220°C (conventional).
2. Bake: Place the wrapped Wellington on a baking tray and bake for 25-30 minutes, or until the pastry is golden brown and the meat reaches your desired level of doneness (use a meat thermometer for accuracy).

Step 7: Serve

Once done, allow the Beef Wellington to rest for 10 minutes before slicing. Serve with your choice of low-carb sides, such as sautéed green beans or a fresh salad.

Conclusion

Keto Beef Wellington with Mushroom Duxelles is a delightful reinterpretation of a classic dish that allows you to indulge in gourmet flavours while keeping your carb count in check. The earthy mushrooms, flavourful beef, and the rich, nutty pastry combine to create a meal that’s both elegant and satisfying. Whether you’re hosting a dinner party or treating yourself to an exquisite meal, this recipe is sure to impress—and keep you firmly on your keto journey. Enjoy!

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