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Put pie shell in the oven to pre-cook for a couple of minutes, until lightly browned.
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Mix and cook filling ingredients in the top half of a double boiler.
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Stir constantly until mixture begins to thicken. This will take about 20 minutes. The texture should resemble a pudding.
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Put on lid and let cook for 10 minutes.
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Remove from heat and stir in butter and vanilla.
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Pour into baked pie shell.
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Beat egg whites and salt until almost stiff.
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Add a large dash of cream of tartar.
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Add sugar one tablespoon at a time.
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Beat until stiff peaks form.
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Top chocolate with stiff egg whites.
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Bake at 375 degrees until meringue is lightly golden.