Preheat the oven to 400°F. Line 2 baking sheets with parchment paper and set aside.
Blend the prunes and hot water in a food processor or high powered blender until smooth. Add more hot water if needed to get a good smooth consistency. Set aside.
8 oz. pitted California prunes, 1/3 cup hot water
Dice the ham and cheese.
3/4 cup deli ham, diced small, 4.4 oz. brie cheese, diced small
Roll out the thawed pastry dough on a lightly floured surface into a square and then cut into smaller squares. I just follow the lines as a guide. You’ll have 9 squares per pastry sheet.
2 puff pastry sheets, thawed
Spread with about 1-2 tsp. of the prune paste and top with ham and cheese.
Dab one corner with egg yolk using a brush. Fold the opposite corner over the filling first, then fold the corner with the egg yolk over it and press down to bond. (see video for guidance)
1 egg yolk
Place on a prepared baking tray lined with parchment paper. Repeat with the remaining squares.
Brush the tops of each folded pastry with the remaining egg.
Bake for 15 minutes or until deep golden brown and puffed.
Serve warm with balsamic glaze, if desired.
balsamic glaze for serving