Ingredients

  • 2 eggs
  • 1/2 cup sugar
  • 1/3 cup freshly squeezed lemon juice (from 3 to 4 lemons)
  • 1/2 lemon, zest freshly grated
  • 2 tablespoons unsalted butter, slightly softened at room temperature
  • 1/2 cup chilled heavy cream
  • 1 package puff pastry (2 sheets), thawed
  • 2 tablespoons chopped pistachios
  • Additional equipment: Flower-shaped or round cookie cutter, preferably fluted, 2 to 2 1/2 inches across, round cookie cutter, 1 inch across, cookie sheet

Method

  • Bring about 2-inches of water to a simmer in a large saucepan.
  • In the bowl of a mixer, fitted with a whisk attachment (or using a hand mixer), whip the eggs and sugar together until very light yellow and fluffy.
  • Mix in the lemon juice and lemon zest.
  • Rest the mixing bowl in the saucepan, with the bowl's base resting above, not in, the simmering water (pour out some water if necessary).
  • Cook, whisking occasionally, until the mixture is thickened and custard-like, about 10 minutes.
  • Meanwhile, half-fill a large bowl with ice and cover with cold water.
  • Remove the bowl with the custard in it from the hot water and whisk in the butter until melted.
  • Rest the bottom of the bowl in the ice bath and let cool, folding the mixture occasionally to cool and thicken it.
  • In a mixer, fitted with a whisk attachment (or using a hand mixer), whip the cream until stiff.
  • Fold into the cooled lemon custard.
  • Cover and refrigerate until ready to serve.
  • (The recipe can be made up to this point and kept refrigerated up to 3 days in advance.)
  • Heat the oven to 350 degrees F.
  • Flour a work surface and lay out the puff pastry.
  • Roll the sheets lightly with a rolling pin until smooth and flattened.
  • Use your large cookie cutter to cut out rounds from the puff pastry.
  • Hollow out the centers by pushing halfway down with your small cookie cutter.
  • Do not pull out the centers yet; you'll do that after they are baked.
  • Arrange on an un-greased cookie sheet and bake until golden brown, 15 to 20 minutes.
  • After 10 minutes, rotate the pan to ensure even cooking.
  • When baked, immediately remove to a wire rack and let cool to room temperature.
  • Cut around the centers with a paring knife to loosen, but don't cut all the way through to the bottom.
  • You want to leave a thin layer of pastry to hold the filling.
  • Pull out the centers to make a hollow in the center of each pastry round.
  • Not more than 4 hours before serving, spoon or pipe a generous dollop of custard into each pastry round.
  • Sprinkle the custard with chopped pistachios.
  • Serve within 4 hours.