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1
Blend all ingredients in processor until clumps form, about 1 minute.
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2
Transfer to medium bowl.
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3
Cover and chill.
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4
(Do not clean processor bowl.)
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5
Combine both flours, hazelnuts, sugar and salt in same processor bowl.
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6
Blend until hazelnuts are finely chopped.
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7
Add butter and blend until coarse meal forms.
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8
Mix in 2 tablespoons ice water and process just until moist clumps form, adding more water by teaspoonfuls if dry.
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9
Gather dough into ball; flatten into disk.
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10
Wrap dough in plastic and chill 30 minutes.
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11
(Topping and dough can be made 1 day ahead.
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12
Keep chilled.)
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13
Position rack in bottom third of oven and preheat to 400F.
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14
Roll out dough between 2 sheets of parchment paper to 13-inch round, lifting paper, smoothing wrinkles and turning over as needed.
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15
Transfer dough on parchment paper to large unrimmed baking sheet.
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16
Remove top sheet of parchment.
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17
Combine pears, sugar and flour in large bowl; toss to coat.
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18
Mound pear mixture atop dough, leaving 2-inch border.
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19
Using parchment paper as aid, fold dough border over pears, pleating loosely and pinching to seal any cracks in dough.
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20
Sprinkle topping thickly over pears.
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21
Bake croustade until crust is golden, about 40 minutes.
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22
Cover very loosely with foil to prevent crust from over-browning and continue to bake until juices bubble thickly, about 12 minutes longer.
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23
Transfer baking sheet to rack; cool slightly.
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24
Slide metal spatula under crust to free from parchment.
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25
Using large tart pan bottom as aid, transfer croustade to platter.
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26
Serve warm with ice cream.