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1
Preheat the oven to 325.
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2
Line a baking sheet with parchment paper.
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3
In a medium bowl, using an electric mixer, beat the butter with the sugar and vanilla until smooth.
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4
Add the all-purpose flour, rice flour and salt and beat just until combined.
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5
Quickly beat in the dried fruit.
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6
Pat the dough in an even layer 1/4 inch thick on the parchment paper.
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7
Bake for about 30 minutes, or until the shortbread is barely golden.
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8
Transfer the baking sheet to a rack and let cool.
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9
Increase the oven temperature to 375.
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10
Break the shortbread into small pieces and transfer to a food processor.
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11
Pulse until fine crumbs form.
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12
Generously butter a 9-inch nonstick springform pan.
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13
Press the crumbs evenly over the bottom and 1/3 inch up the side of the pan.
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14
In a large bowl, using an electric mixer, beat the Robiola cheese with the cream cheese until smooth.
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15
Beat in the sugar and vanilla seeds, then add the eggs, 1 at a time, beating well between additions.
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16
Beat in the sour cream, apricot nectar and sherry until blended.
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17
Beat in the cornstarch.
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18
Pour the filling into the crust.
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19
Bake for about 15 minutes, then lower the oven temperature to 325 and bake for 15 minutes longer, until the center of the cake is still slightly jiggly.
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20
Transfer to a rack to cool, then refrigerate for at least 3 hours or overnight.
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21
Serve cold.