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Making zigzag edges, cut the oranges in half.
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Cut out all the orange pulp, scraping it out with a spoon if necessary.
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Rinse the shells, dry them and put in the freezer.
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Remove the seeds and white membrane from the orange pulp.
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Combine the orange pulp, sugar, cornstarch, ginger, cinnamon and raisins in a saucepan.
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Bring to a boil, stirring; boil gently until slightly thickened.
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Cover and chill.
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Remove the shells from the freezer and fill with a scoop of ice cream.
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Cover with plastic wrap and return to the freezer until ready to serve.
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To serve the dessert, place each orange shell in a small dish.
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Spoon the spiced orange syrup over the ice cream.
