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To make Crust: Place flours, oil, and salt in bowl of stand mixer with paddle attachment.
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Slowly drizzle in 7 to 9 Tbs.
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ice water with machine running on medium-low speed.
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Mix 5 to 7 minutes, or until smooth, pliable dough forms.
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Divide into 2 balls, cover in plastic wrap, and let sit at room temperature 1 hour, or in refrigerator overnight.
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To make Filling: Toss chard with salt in bowl.
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Transfer to colander, and let stand 1 hour.
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Place on clean kitchen towel, roll up tightly, and squeeze out as much liquid as possible.
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Transfer to large bowl.
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10
Combine potato and enough water to cover by 1 inch in small saucepan.
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Bring to a boil, then reduce heat to medium-low, and simmer 5 minutes.
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Drain, and add to chard.
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Heat 2 Tbs.
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oil in large skillet over medium-high heat.
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Add leeks, and cook
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5 to 7 minutes, or until soft.
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Add mushrooms, and cook 5 to 7 minutes, or until most mushroom liquid has evaporated.
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Stir in garlic and nutmeg, and cook 1 minute more.
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Add leek mixture to bowl with chard, stir, and cool 20 minutes.
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Stir in eggs until well combined, then stir in Asiago and Parmesan.
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Season with salt and pepper, if desired.
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Preheat oven to 375F, and line 12-inch round pizza pan with parchment paper.
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Roll 1 dough ball into 13-inch circle on floured work surface (dont worry if dough resists a little).
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Let dough rest 10 minutes, then continue to roll and stretch (dough will be extremely thin).
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Gently roll dough circle onto rolling pin, then unroll onto parchment.
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Top dough with Filling, leaving 1-inch border.
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Roll out remaining dough round in same manner, and drape over Filling.
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Seal torta by crimping bottom dough over top layer or by rolling together in rope pattern.
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Drizzle remaining 1 Tbs.
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oil over top Crust, and rub in evenly with hands.
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Cut several vents in top Crust, and bake 50 to 60 minutes, or until bottom Crust is golden brown.
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Serve hot, at room temperature, or chilled.