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In a small mixing bowl, stir together sugar, cocoa and salt. Gently stir in water.
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Pour mixture in a saucepan and warm over a medium heat, stirring constantly, until mixture comes to a boil. Stir 2 minutes more.
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Lower heat and add milk, stirring constantly. Warm milk through, but do not allow milk to boil.
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Remove from heat and add vanilla. Beat with a whisk until foamy. Then, pour hot chocolate into a mug.
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Add fluff to a small storage-size Ziploc bag. Cut a small hole in corner of bag and pipe over cocoa carefully so it floats.
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Very carefully pour chocolate syrup around rim of mug.
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Grate milk chocolate over fluff.
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Add one square of graham cracker to hot chocolate and serve.