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To make the pastry: Whisk together the flour and salt.
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Work in the butter until pea-sized pieces form.
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Add the egg yolk and ice water. Toss until the dough comes together, adding more water if necessary.
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Divide the dough in half, wrap, and chill for at least 30 minutes.
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Preheat the oven to 400°F. Grease every other cup of a 24-cup mini muffin pan (the dough tends to overflow a bit out of the wells so filling every other well prevents the tarts from touching one another).
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Roll one disk of dough 1/8" thick. Cut ten 3 1/2" fluted circles.
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Place the circles into prepared wells of the pan. Press the excess dough flat against the pan. Prick the base of each crust with a fork.
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Bake the crusts for 12 to 16 minutes, until the pastry is golden. Remove them from the oven.
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To make the meringue: Dissolve the sugar in the boiling water. Cool, then add the meringue powder and beat until stiff peaks form.
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Fill the baked cups with lemon curd, then dollop the meringue on top.
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Bake the pies for 7 to 10 minutes, until the meringue is lightly browned.
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Remove from the oven; when the pies are cool enough to handle, transfer them from the pan to a rack to cool completely.
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Repeat with the remaining dough, filling, and meringue, making an additional 10 pies.
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Store the mini pies at room temperature if they'll be eaten the same day. Otherwise, keep the pies in an airtight container in the refrigerator for up to several days,