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In a large mixing bowl, combine the flour and salt. Cut in the shortening until it resembles pea-sized chunks.
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Using a fork, make a little well in the side of the pastry and pour in the water. Use the fork to blend the flour mixture and water together, until it comes together in a soft, shaggy dough (DO NOT OVER MIX). Start with the lesser amount of water, and then add more if needed to bring the dough together.
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Cover with plastic and set the pastry in the fridge for about 20 minutes.
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Once the pastry has been able to rest, take about 1/2 of the pastry and press it into a 6″ circle on a lightly floured work surface.
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Dust your rolling pin with a bit of flour, and roll the pastry out till it’s about 1/8″ thick (turning the dough as you work with it to make sure it’s not sticking to the table; if you find it sticking, dust with a bit more flour and continue rolling.)
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Using a 4″ biscuit cutter, cut out circles of pastry and lightly press each one into an ungreased muffin tin.
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Lightly press the pastry circles into a muffin tin, and prick the dough through with a fork a few times per tart shell.
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Bake the pastry shells for about 15-20 minutes at 375 degrees F or until lightly golden around the edges. Set aside to cool.
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Read the directions on your pie mix box. A boxed pie filling mix should call for 2 eggs, using the yolks in the filling and setting the whites aside for the meringue. Prepare your pie filling as per the package directions, but add an additional 2 egg yolks, and set the 4 egg whites aside to make the meringue.
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Prepare the meringue as per the package directions, doubling the recipe to use your 4 egg whites (instead of 2). Spoon the meringue into a large piping bag or ziplock bag and snip off enough of the end/corner to make a 3/4″ cut. Pipe a cloud of meringue onto each pie to completely cover the lemon filling, making sure the meringue goes right to the edge of the pastry. Alternatively, you can fit a piping bag with a large round or star tip to make the dollops of meringue on top.
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Bake at 375 degrees F for 10-12 minutes, or until the tops are golden brown. I like mine a little longer, for the toasted marshmallow look – but you can go a little lighter if you want to.
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Cool on wire racks. Store in the refrigerator. Serve cold.