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1
Preheat the oven to 450 degrees F.
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2
Generously butter a 9-inch springform pan and dust the bottom and sides with the ground cornflakes.
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3
Wrap the pan in heavy-duty aluminum foil, then refrigerate the pan while preparing the batter.
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4
In a large mixing bowl, use an electric mixer to combine the cream cheese, sour cream, sugar, cornstarch, orange and lemon extracts, and salt.
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5
Add 3 of the eggs, 1 at a time, mixing well after each addition.
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6
Separate the remaining 2 eggs.
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7
Mix the yolks into the batter.
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8
In another bowl, with the mixer on low speed, beat the heavy cream, egg whites, and confectioners' sugar until combined.
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9
Stir the cream mixture into the batter, then strain through a fine mesh sieve into the chilled pan.
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10
Set the springform pan in a roasting pan and add enough hot water to come halfway up the sides of the springform.
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11
Cover the top with aluminum foil and bake for 15 minutes.
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12
Lower the oven temperature to 250 degrees F, uncover, and bake for 2 hours more.
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13
Increase the heat to 350 degrees F. and bake until light golden and set, about 10 minutes more.
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14
Place on a rack to cool completely, then refrigerate overnight.
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15
Release pan sides and transfer cheesecake to a platter.