01 - Preheat the oven to 400°F. Line a baking tray with parchment paper.
02 - Heat olive oil in a frying pan over medium-high heat. Add the chopped onions and cook for 2 minutes until softened. Add the minced garlic and cook for 30 seconds until fragrant.
03 - Add the diced steak to the pan and fry until browned all over, about 3 minutes. Stir in the Worcestershire sauce, salt, and pepper to season.
04 - Sprinkle the flour over the steak mixture and stir well to coat. Pour in the beef stock and cook for 2 to 3 minutes until the liquid thickens into a glossy sauce. Remove from heat and let cool slightly, then stir in the grated cheddar until melted and evenly distributed.
05 - Unroll the puff pastry onto a lightly floured surface. Cut the sheet into four equal rectangles.
06 - Spoon equal portions of the steak and cheese filling along one long edge of each pastry rectangle.
07 - Brush the pastry edges with beaten egg, fold each rectangle over the filling, and press firmly to seal. Place seam-side down on the prepared baking tray. Use a fork to crimp and seal the edges securely.
08 - Cut a few small slits in the top of each roll to allow steam to escape. Brush the tops generously with more beaten egg for a golden finish.
09 - Bake for 20 to 25 minutes until the pastry is golden brown, puffed, and crisp.
10 - Allow the rolls to cool slightly on the tray before serving.