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Dice the rhubarb and place on a baking sheet and sprinkle with a little sugar.
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Bake at 325 degrees for 30 - 40 minutes. Let cool. Set aside.
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Make the filling. Put the lemon juice in a medium bowl.
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Peel, halve, and core the apples.
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Cut each half into 4 wedges. Toss the apple with the lemon juice.
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Add the sugar and toss to combine evenly.
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In a large skillet, melt the butter over medium-high heat.
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Add the apples, and cook, stirring, until the sugar dissolves and the mixture begins to simmer, about 2 minutes.
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Cover, reduce heat to medium-low, and cook until the apples soften and release most of their juices, about 7 minutes.
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Strain the apples in a colander over a medium bowl to catch all the juice.
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Shake the colander to get as much liquid as possible.
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Return the juices to the skillet, and simmer over medium heat until thickened and lightly caramelized, about 10 minutes.
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In a medium bowl, toss the apples with the reduced juice and spices. Set aside to cool completely.
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Cut the dough in half. On a lightly floured surface, roll each half of dough into a disc about 11 to 12 inches wide.
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Layer the dough between pieces of parchment or wax paper on a baking sheet, and refrigerate for at least 10 minutes.
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Place a rack in the lower third of the oven and preheat the oven to 375 degrees F.
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Line the bottom of a 9-inch pie pan with one of the discs of dough, and trim it so it lays about 1/2 inch beyond the edge of the pan.
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Put the apple and rhubarb filling in the pan and mound it slightly in the center.
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Brush the top edges of the dough with the egg.
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Place the second disc of dough over the top. Fold the top layer of dough under the edge of the bottom layer and press the edges together to form a seal.
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Brush the surface of the dough with egg and then sprinkle with sugar.
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Pierce the top of the dough in several places to allow steam to escape while baking.
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Refrigerate for at least 15 minutes.
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Bake the pie on a baking sheet until the crust is golden, about 50 minutes.
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Cool on a rack before serving.
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Cut a big piece of pie and grab a couple scoops of vanilla ice cream.
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Serve and enjoy!