In the bowl of a food processor, place both flours, powdered sugar and salt. Pulse once or twice.
Place cold butter and cold shortening into flour mixture and pulse about six times until fat forms small pea sized shapes.
Add vanilla and egg and pulse to combine.
Add cold water and pulse just until mixed.
On a floured surface, pour contents of food processor and form with your hands into a thick disk shape dough. Cover tightly with plastic and refrigerate one hour.
After the hour, remove plastic and place dough on floured work surface and roll to 18 X 24 inches. Using a three inch cookie cutter cut out circles. Collect and roll out scraps again on a floured work surface and cut more circles to yield a total of 48 circles. Discard remaining scraps.
Lightly dust work surface and lay out the 48 circles. Place 1 ½ teaspoons of cold jam into the center of 24 circles.
Preheat oven to 375 degrees.
Dip your fingers in a little bowl of water and wet the outside edge of a filled circle. Pick up a plain circle and press it in your fingers to make it slightly larger than the circle it will cover. Lay it over the circle you just wet and press down all edges. Repeat for the remaining circles until you have 24 complete. Use a fork and go back over all 24 brambles and gently press all of the edges of each.
Prepare two sheet pans by lining them with parchment.
Place 12 on each pan. If they stick to the counter a bit, use a bench scraper or spatula to lift them from counter and slide onto the pan.
Beat the egg with a tablespoon of water and brush the tops of each bramble. Sprinkle the turbinado sugar over the egg washed tops. Finally with a toothpick make a small vent hole in the top of each.
Bake for 20 minutes. Towards the end of the bake time, just as they are finishing browning, the jam will ooze from the vent hole. This is what you want and is part of the look of this pastry.
Remove to a cooling rack immediately so they don’t stick to the parchment paper while cooling.
Serve immediately or, once cooled, store tightly covered at room temperature.
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