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1. Preheat the oven to 350u00b0F. Place the flour, margarine, salt and 1/2 cup of the sugar in the bowl of a food processor fitted with a metal blade. Pulse about seven times, or until the mixture looks like sand. You can also do this by hand in a large bowl with two knives or a pastry cutter. Add 1 egg yolk, the vanilla, orange blossom water, if using, and the tablespoon of cold water. Process or mix just until the dough comes together.
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2. Place a large piece of parchment on the counter and grease lightly using the paper or foil wrapper that wrapped the margarine. Dump the dough onto the greased parchment and, using a rolling pin, roll into a large circle, about 9 inches in diameter.
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3. To decorate the edge of the cookie, using the flat end of the handle of a wooden spoon, or the tip of your index finger, make indentations one after the other all around the outside of the circle.
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4. Whisk together the remaining egg yolk with the 1/2 tablespoon of water. Brush the top of the cookie with egg wash. Using the tines of a fork, make one set of lines straight across the top of the cookie. Make another set about 2 inches below the first. Repeat until you have four to five sets of lines. Now slide the parchment a quarter turn to the right and make four to five additional sets of lines, each about 2 inches apart. The new set of lines should cross the first set of lines on an angle, creating a diamond-shaped grid.
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5. Sprinkle the top of the cookie with the remaining teaspoon of sugar. Slide the parchment onto a cookie sheet and bake for 35 to 37 minutes, until the edges start to look golden. Remove from the oven and immediately cut the cookie into 8 or 12 large wedges or about eighteen 1 x 3-inch bars, if you like. If you wait until the cookie cools to cut it, you will not get nice clean edges.
