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Preheat oven at 400°F; prepare a baking sheet.
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Pour the egg whites, sugar and vanilla sugar into a saucepan over medium heat, then start whisking vigourously until they get hot and frothy.
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Take away from flame and keep whisking until temperature cools down a bit.
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Pour the shredded coconut in all at once and mix together with a wooden spoon.
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Place balls of coconut mixture on the baking sheet (about 2.5 inches in diameter).
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Bake for 15 minutes until they get golden; the Congolais must be crunchy outside and soft inside.
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Serve the biscuits warm or cold, simply by themselves or with a ball of vanilla ice-cream.