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1
Have ready 8-10 custard cups, an equivalent number of squares of plastic wrap to fit the cups, and a tea strainer.
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2
Pre-heat oven to 150u00b0 F. When warm, place the saffron on a small square of aluminum foil and place in the center of oven to toast lightly. After 5 minutes, turn off the oven, leaving the saffron in the oven for another 5 minutes, then remove and place in mortar. Pound saffron threads until pulverized. Set aside.
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3
Place one inch of water in the base of a double boiler and bring to a simmer. In the top of the double boiler (or in a small bowl that sits on the rim), place the chopped white chocolate and fit the top on the base, over but not touching the water. You can turn off the heat to avoid scorching. With a small whisk, stir the white chocolate until just melted and completely smooth. Set aside while you prepare the rest.
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4
Prepare a second double boiler with one inch of water and bring to the simmer. Turn heat to very low while you continue with the next step. (Or use the base of the same double boiler, removing the bowl with the melted chocolate).
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5
In a small bowl, stir together the sugar and the cornstarch thoroughly, breaking up any lumps. When completely mixed, slowly whisk 1 cup of the (cold) milk into the center of the cornstarch mixture, gradually incorporating the rest of the mixture from the perimeter into the milk. Whisk until smooth.
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6
In a heavy saucepan, scald the remaining 4-1/2 cups of milk, stirring. Whisk in the pinch of salt. Pour the hot milk into the top of the large double boiler, place over the simmering water, and stir. Give the cornstarch-milk mixture in the separate bowl a final whisk to re-incorporate and scrape the cornstarch-milk mixture into the scalded milk.
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7
Switch to a heat-proof spatula and continue to heat and stir the cornstarch mixture over medium-low heat, scraping the bottom of the pot, until thickened. This may take 10- 20 minutes or so. The mixture will lightly coat the back of the spoon. When it does, remove from heat, separate top and bottom of the double boiler, and stir in the most of the spice and up to 1 teaspoon of the orange flower water. You will want to add the flavorings incrementally--gentle, fragrant flavor is key. Stir well; the spices tend to clump together. Taste the mixture for a good blend of flavors--neither the spice nor the orange flower water should predominate. Add the remaining spice and 1/2 teaspoon orange-flower water according to taste. (The strength of different brands of orange-flower water may vary). Whisk again to incorporate the spices, then take a one-cup dry measure and scoop out about 3/4 cup of the custard, whisk it into the white chocolate to blend, then scrape the white chocolate mixture back into the custard, mixing completely.
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8
Using a ladle and the tea strainer for smoothness, strain the custard into each of the custard cups. Place a square of plastic wrap directly on the surface of each custard to prevent a skin from forming. Allow the custards to cool to lukewarm, then chill in the refrigerator for at least 2 hours. They will firm up with chilling, yet remain creamy.
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9
Just before serving, garnish with chopped toasted pistachios.
