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1
Preheat oven to 375AF.
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2
To make the crust:
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3
Whisk together whole-wheat flour, all-purpose flour, sugar and salt in a medium bowl.
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4
Cut in butter with a fork or your fingers.
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5
Stir in oil and vinegar.
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6
Stir in enough water to form a moist and a little crumbly dough but not wet and sticky.
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7
Gather the dough into a ball, then pat it into a disk.
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8
Dust a cutting board or work surface with flour and transfer the dough onto it.
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9
Dust the dough with flour and roll into an 8-inch circle, dusting more flour as needed to prevent sticking.
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10
Arrange the crust to a 6-inch tart pan with removable bottom.
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11
Press the crust into the bottom and up the sides, folding the overhanging dough back into the pan in order to form double-thick sides.
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12
Prick the bottom and sides with a fork.
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13
Bake until lightly browned, about 22 minutes.
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14
Set aside to let cool for about 8 minutes.
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15
Increase the oven temperature to 425A.
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16
While the crust is cooling, whisk egg yolk and 2 tablespoons sugar in a medium bowl until thick and pale yellow, about 2 to 3 minutes.
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17
Whisk in cornstarch until well mixed.
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18
Add water, lemon zest and lemon juice in a small saucepan and bring to a boil over medium heat.
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19
Remove from the heat.
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20
Slowly whisk about half the lemon mixture into the yolk mixture.
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21
Slowly whisk the combined mixture back into the remaining lemon mixture in the pan.
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22
Return the pan to the stove and cook over low heat, whisking frequently, until thickened and looks like pudding, about 2 minutes more.
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23
Pour into the prepared crust and spread evenly to the edges.
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24
Beat egg white in a small bowl with an electric mixer at medium-high speed until soft peaks form.
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25
Gradually beat in the remaining 4 teaspoons sugar until stiff peaks form.
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26
Beat in vanilla.
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27
Mound the meringue over the warm filling, spread to the crustaTMs edges, forming peaks with a rubber spatula.
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28
Bake the tart until the meringue is lightly browned, 7 to 9 minutes.
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29
Allow to cool on the baking sheet for 15 minutes.
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30
Transfer to a wire rack and cool completely.
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31
Serve.
