Ingredients
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1 pound beef tenderloin, cut into small cubes
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1 tablespoon olive oil
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Salt and pepper, to taste
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1 tablespoon butter
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1/2 cup finely chopped mushrooms
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1/4 cup finely chopped onion
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1 teaspoon minced garlic
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1/4 cup dry white wine
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1 tablespoon Dijon mustard
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1 sheet puff pastry, thawed
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1 egg, beaten (for egg wash)
Instructions
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Preheat oven to 400°F (200°C).
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Sear the beef: In a skillet over medium-high heat, heat olive oil. Season beef cubes with salt and pepper, then sear until browned on all sides. Remove from skillet and set aside.
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Prepare the mushroom mixture: In the same skillet, melt butter. Add mushrooms, onion, and garlic; sauté until softened. Pour in white wine and cook until liquid is reduced. Stir in Dijon mustard. Remove from heat.
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Assemble turnovers: Roll out puff pastry and cut into squares. Place a spoonful of mushroom mixture and a few beef cubes in the center of each square. Fold over to form a triangle and seal edges.
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Bake: Place turnovers on a baking sheet lined with parchment paper. Brush with beaten egg. Bake for 20-25 minutes or until golden brown.
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Serve: Allow to cool slightly before serving.​