On a lightly floured surface, roll dough to less than 1/4 inch thickness; cut into 2.5 inch rounds with fluted cutter
Place small amount of filling in the middle of each circle (a heaping teaspoon); dot water along inside edge of each pastry circle to seal
Fold dough over filling to form a half-circle; press to seal dampened edges
Place on cookie sheet lined with parchment paper; press edges with a fork and puncture each decoratively to release steam while cooking OR recut sealed edges with the cutter, as illustrated
Pre-heat oven to 375°F if baking immediately
Brush with egg yolk; bake for 12 minutes, at 350°F, or until golden brown OR
Brush with egg yolk and freeze on parchment-lined cookie sheet overnight; then package into labelled and dated zip-lock freezer bags
Remove from freezer, place on parchment-lined cookie sheet and bake frozen at 400°F for 15 – 18 minutes, until golden