Line a baking tray with a silicone mat. Combine all ingredients in a small saucepan and stir over high heat until clear. Bring the mixture to 165°C (320°C) then remove from the heat. Spread the mixture onto the tray and allow to set.
Break the sugar into pieces, then blitz in a food processor to the texture of small crystals. Pass through a fine drum sieve. Line a baking tray with a silicone mat. Working in batches, spread the crystals out sparsely on the tray.
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