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1
Adjust oven rack to middle position and preheat oven to 325u00b0F. Place clean kitchen towel in roasting pan. Wrap exterior of 9-inch springform pan with foil and set on top of towel. Set tea kettle or pot of water to boil.
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2
Combine 1 cup sugar and 1/4 cup water in medium heavy-bottomed saucepan. Cook over medium-high heat, swirling pan occasionally, until sugar is completely dissolved. Dampen a clean pastry brush and brush down any sugar crystals from sides of pan. Boil, swirling pan occasionally, until sugar turns deep amber, 6 to 10 minutes. Immediately pour caramel into springform pan and swirl to evenly coat bottom; set aside.
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3
Meanwhile, place rice, remaining 1 1/2 cups water, and salt in medium microwave-safe bowl. Cover tightly with plastic wrap and microwave until most of the water is absorbed, 6 to 8 minutes.
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4
Bring remaining 1 cup sugar, milk, sweetened condensed milk, cinnamon sticks, and orange zest to boil over medium-high heat in large heavy-bottomed saucepan. Add rice, reduce heat to medium-low and simmer, stirring frequently, until mixture is thickened and rice is completely tender 15 to 20 minutes.
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5
Remove from heat and stir in raisins. Cool to room temperature (See notes).
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6
When cooled, stir in egg yolks.
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7
In clean, dry bowl beat egg whites with whisk attachment on medium-low speed until whites begin to froth, about 1 minute. Increase speed to medium-high and beat whites until stiff peaks form, 3 to 4 minutes. Fold egg whites into rice pudding mixture with rubber spatula. Scrape rice mixture over caramel in springform.
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8
Open oven door and set roasting pan and flan on oven rack. Carefully pour hot water into roasting pan-water should reach halfway up sides of flan pan. Bake until flan is set, but still a bit wobbly, about 1 hour, 30 minutes.
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9
Remove springform pan from roasting pan and cool on rack, about 15 minutes. Chill completely in refrigerator, 2 to 3 hours. Run a knife along flan edges and invert onto serving plate. Remove and discard foil and open springform mold. Remove bottom. Serve.
