To get razor-sharp cuts through the curd and crust, use a very sharp knife dipped in warm water. Rewet it every few cuts to maintain ultra-precise edges.
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Crust:
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3/4 cup all-purpose flour
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1/4 cup confectioners' sugar plus extra for dusting
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1/8 tsp. salt
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6 Tbsp. cold unsalted butter, cut into 1/4-inch pieces