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Bring 1 cup water to a boil in a small saucepan.
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Add rind; reduce heat, and simmer for 2 minutes.
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Drain, but reserve rind.
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Combine rind, sugar, and juice in pan; bring to a boil, stirring constantly until sugar dissolves.
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Reduce heat, and simmer 20 minutes.
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Remove from heat.
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Combine the juice mixture and buttermilk.
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Pour into a 9 inch pan.
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Freeze 4-6 hours stirring every 30 minutes.
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Serve or freeze for up to one week.
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To serve scrape surface of granita with a metal spoon.
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Garnish.
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Chocolate garnish- In a microwave safe bowl heat chocolate in intervals of 30 seconds until chocolate melts.
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Using a piping bag or end of fork drizzle chocolate to form letters on parchment paper.
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Refrigerate until ready to use.