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1
To make the dough, mix the all purpose flour, whole wheat pastry flour, salt, and sugar in the bowl of a mixer fitted with the paddle attachment. Add the butter and shortening, and mix until there are no pieces larger than a pea.
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2
In a small bowl, combine the egg yolk, vinegar, and 1/4 cup of ice water. Drizzle this mixture over the flours and butter, and mix until combined and the dough comes together. If the dough is too dry, add more ice water, one tablespoon at a time. Collect the dough, form it into a disc, wrap in plastic wrap, and refrigerate for at least 30 minutes (and up to 2 days).
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3
Preheat your oven to 400u00b0 F and line a rimmed baking sheet with parchment paper. In a food processor, combine the almonds, granulated sugar, and all purpose flour, and process until there is a coarse meal. If you're using ground almonds, simply combine it with the sugar and flour in a small bowl. Set the almond mixture aside.
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4
In a mixing bowl, combine the sliced plums, lemon zest, and brown sugar, tossing to coat evenly. Set aside.
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5
Remove your dough from the fridge. On a lightly floured surface, roll out your dough to a 14-16 inch circle about 1/8 inch thick. Transfer the rolled out dough to the parchment lined baking sheet. Spread almond mixture in the center of the dough, leaving a 2-inch edge all the way around. Pile your plums and their juices on top of the almond mixture (or gently arrange them in concentric circles), and then gently fold up the edge of the dough over the plums.
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6
Bake for 35-45 minutes, until the filling is bubbling and the edges of the crust are golden brown. Allow to cool for at least 1 hour. Enjoy with ice cream of freshly whipped cream.
