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1
Butter a 9 by 12 1/2-inch baking pan.
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2
Line pan with foil and leave about 2 inches extra on all sides.
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3
Butter the foil.
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4
Whisk the flour, cornstarch, and salt together in a bowl.
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5
In a standing mixer fitted with the paddle attachment or with a hand mixer, beat the butter with the sugar on medium, until light and fluffy, about 4 minutes.
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6
Turn mixer to low speed, add the dry ingredients and mix until just combined.
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7
Do not overwork the dough.
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8
Transfer dough to prepared pan, spreading it out evenly across the pan.
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9
Press the dough to make a 1/4-inch thick covering over the bottom of the pan.
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10
Cover with plastic wrap, then press and flatten using your hands to smooth and even out the dough.
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11
Refrigerate for 1 hour.
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12
Preheat oven to 325 degrees F.
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13
Remove the plastic from the top of the dough and prick the dough with a fork or a wooden skewer.
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14
Bake the crust until just golden, about 30 minutes.
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15
Meanwhile, melt the jelly in the microwave until soft enough to spread, about 1 minute.
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16
Spread the jelly with a pastry brush or an offset spatula over the crust.
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17
Return to the oven and cook another 10 minutes.
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18
Cool crust completely on a wire rack, 1 hour.
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19
Meanwhile, whisk the eggs, yolks, sugar, sweetened condensed milk, flour, and salt together in a medium bowl.
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20
Beat until thick and slightly pale.
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21
Stir in the citrus juices and zest, and whisk gently to blend well.
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22
Pour the filling onto the cooled crust and bake until the filling is firm but still loose and wobbly in the center, about 25 to 30 minutes.
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23
Cool to room temperature, about 30 minutes.
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24
Chill in the refrigerator for at least 1 hour or overnight before cutting.
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25
Remove bars from refrigerator and dip the bottom of them in warm water to soften the butter and release the foil from the sides of the pan.
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26
Use foil to lift pastry out of the baking pan and transfer to a cutting board.
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27
Using a sharp knife or a pizza cutter, cut into about 50 1 1/2-inch squares, wiping down the knife with a hot, wet towel between cuts.