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Preheat the oven to 400 degrees Fahrenheit.
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Cover the bottom of a pie pan with pie pastry.
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Peel, core and slice the Granny Smith apples.
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In a large bowl combine the sugar, flour, salt, cinnamon, nutmeg, allspice and apples.
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Pour the mixture into the pastry lined pie pan.
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Dot the apples with the butter and then cover the pie with a top pastry.
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Seal the edges and cut steam vents. Brush the pie with egg whites to allow the crust to brown nicely (This is optional, but provides a nice looking pie).
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Bake for 40 minutes or until crust is golden browned.
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Remove from the oven and allow the pie to completely cool.
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Making the Glaze
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In a small bowl combine the softened butter, powdered sugar and vanilla. Then slowly mix in the milk, 1 tsp at a time until the glaze has a runny texture. Mine took 5 tsp of milk.
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Pour the glaze over the pie and allow to set. Approximately 15 minutes.
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Slice and eat.