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Preheat oven to 450°.
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Cover the bottom of a 9" pie pan with half of your pie dough.
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Fill the pie with rhubarb, it should make a nice mound but not so high that you can't cover it.
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In a bowl, mix 1 cup of sugar, the cornstarch and the salt, and pour over the rhubarb in the pie.
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Cover with the remaining pie dough, and poke holes in it with a fork or cut slits for venting.
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Sprinkle the 2 tsp of sugar over the top.
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Bake for 15 minutes.
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Lower the heat to 350°, and bake for another 45 minutes.
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Cool completely before serving.