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1
In a food processor or heavy-duty mixer, combine the flour, salt and baking powder.
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2
Add the water and oil.
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3
Process or mix until the dough is smooth and elastic, about 1 minute.
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4
Remove from the machine, and knead briefly by hand on a lightly floured surface.
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5
Shape the dough into a ball.
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6
Cover with a bowl, and let rest 20 minutes to 1 hour.
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7
Cut the dough into 8 pieces.
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8
Cover all but 1 piece with a bowl.
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9
On a lightly floured surface, shape the piece into a ball.
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10
With a rolling pin, roll out the dough to an 8-inch circle.
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11
Place a piece of wax paper on a large dinner plate, and put the circle of dough on it.
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12
Roll out the remaining dough, stacking the circles on the plate with wax paper in between.
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13
Preheat the oven to 175 degrees.
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14
Heat a nonstick skillet over medium-high heat.
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15
Test the temperature by flicking some droplets of water onto the surface; if the water sizzles and evaporates quickly, the griddle is ready.
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16
Place a circle of dough in the skillet.
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17
Cook 30 seconds, or until the dough begins to stiffen and turns golden brown.
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18
Flip the piadina, and brown the other side.
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19
Place the piadina on a piece of foil in the oven, and keep warm until serving.
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20
To serve, on each piadina, spread about 2 tablespoons of cheese over half the circle.
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21
Place a handful of arugula on top, and then fold the piadina in half and serve.