01 -
Heat olive oil in a skillet over medium-high heat. Season beef cubes with salt and pepper, then sear for 2-3 minutes per side until browned. Remove from heat and allow to cool.
02 -
In the same skillet, cook mushrooms, shallots, and garlic until the mushrooms release moisture and turn golden brown, about 5-7 minutes. Stir in thyme, season with salt and pepper, then set aside to cool.
03 -
Lightly dust a clean surface with flour and roll out the thawed puff pastry to approximately 1/8 inch thickness. Cut into 3-inch squares to create uniform portions.
04 -
Place a spoonful of the cooled mushroom duxelles onto each pastry square. Add a seared beef cube on top, optionally brushing with Dijon mustard. Fold the pastry over the filling to form a pocket and seal the edges by pressing with a fork.
05 -
Preheat the oven to 400°F (200°C). Arrange the assembled bites on a parchment-lined baking sheet. Brush each with the beaten egg wash to develop a golden crust, then bake for 15-20 minutes until puffed and golden brown.
06 -
Allow the bites to cool for a few minutes to avoid burns. Serve warm as an elegant appetizer or snack.