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1
To make the crust, in a medium bowl combine flour, salt, seeds, and black pepper. In a small bowl whisk together egg, egg white, water, and olive oil. Whisk well to thoroughly combine.
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2
Add the wet ingredients to the dry ingredients and stir together with a fork. Turn the dough out onto a lightly floured work surface and knead until the dough comes together in a disk. Add a bit more water or flour as necessary. Wrap the disk in plastic wrap and allow to rest in the refrigerator while you make the filling. Crust can also be made ahead and left to rest in the fridge for two days.
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3
To make the filling, place a rack in the upper third of the oven and preheat oven to 375 degrees F.
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4
Cut acorn squash in half and remove inside fibers and seeds. Slice the squash into 1/2-inch thick semicircles and place on a rimmed baking sheet.
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5
Slice the onion in half, remove the skins and slice into 1/4-inch semicircles. Place the onions on the rimmed baking sheet as well.
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6
Smash the clove of garlic and toss it on the baking sheet.
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7
Clean mushrooms with a damp paper towel, slice into bite-size pieces and place on the baking sheet.
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8
Drizzle vegetables with olive oil. Sprinkle with salt and pepper and place in the oven to roast.
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9
Roast until all vegetables are softened and browned, about 25 minutes. Remove from the oven and allow to rest until cool enough to handle.
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10
Once cool, scrape the soft squash from their skins and place in a medium bowl. Spoon the onions, garlic and mushrooms into the bowl as well. Add cumin and garam masala (if using), and season to taste.
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11
To assemble the tarts, first line a baking sheet with parchment paper and set aside. Next, roll out the olive oil crust. There are two ways to roll out the crust. You can divide the dough into 4 equal pieces and roll each piece out into 8x8-inch squares. You can roll the entire disk out into a 1/4-inch thickness, and use a knife to slice the dough into 6x6 or 8x8-inch squares.
