To make the pie crust:

Cup of Yum
1. In a large bowl, combine the flour, sugar, and salt.
2. Cut in the cold butter using your fingers, two forks, or a dough blade until the mixture becomes coarse and no pieces are larger than a pea. If needed, stir in just enough water water to bring together a smooth dough. Form the dough into a disc, wrap in plastic, and refrigerate for at least 30 minutes.

To assemble:

1. Preheat oven to 400˚F and line two large baking sheets with parchment or lightly grease.
2. On a lightly floured surface, roll out the chilled pie crust into an 1/8 inch thick sheet. Use a 2 1/2-3 inch round or heart cookie cutter to cut out circles or hearts of dough. Place half the circles on prepared baking sheets.
3. Put a spoonful (about 1/2 tablespoon) of Nutella in the center of each circle on the baking sheet and top with a few strawberry pieces. Do not overfill. Cover each with the remaining circles. Close by pressing the edges together with a fork. Poke or slice holes in the top of each pie.
4. In a small bowl, whisk together the egg yolk and water. Brush over the tops of each sealed hand pie. If desired, sprinkle the tops with sugar.
5. Bake in preheated oven until golden, 12-14 minutes. Allow to rest on the baking sheet for 5 minutes before serving.