1️⃣ Cut the beef into 1-inch pieces (2.5 centimeters) and season with salt and black pepper. 🧂🌶️

2️⃣ Heat oil in a skillet/frying pan and brown half of the beef pieces on high heat on all sides, about 1-2 minutes max! Transfer onto a plate lined with a paper kitchen towel and repeat with the other half. Set aside. 🍳

3️⃣ Preheat oven to 400°F (200°C). 🔥

4️⃣ In the same skillet, heat a little oil, add minced onion and chopped mushrooms, and sauté for 10 minutes on medium-low heat, stirring occasionally. Add soy sauce, oregano, black pepper and stir well. 🍄🧅

5️⃣ Transfer the mixture to a food processor and add olives (make sure there are no stones in them). Process until smooth-ish. 🫒🔄

6️⃣ Unfold/unroll puff pastry sheet and cut it into about 3-3.5 inch (8-9 centimeter) squares. Spread some mustard in the center of each square, then spread some mushroom mixture over. Top with a piece of beef. Grab 2 opposite tips of the pastry and fold them over the beef. Repeat with the other two corners/tips. Make sure to press down the corners so they don’t open during cooking. 🥐

7️⃣ Transfer the parcel onto a baking tray lined with baking parchment. Repeat with the rest of them. Brush them with beaten egg. 🥚

8️⃣ Bake in a preheated oven at 400°F (200°C) for 10-15 minutes or until the pastry is puffed and golden brown. 🕒🥐

9️⃣ Best served warm with a dipping sauce of your choice. Enjoy! 😋