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Begin by making the vinegar gel. This will make more than you need for this recipe, but it is difficult to make properly in smaller quantities. Mix all of the ingredients together in a saucepan, whisking until the powders are fully incorporated into the vinegar. Bring to the boil over a high heat and continue whisking for 1 minute. Pour the mixture onto a tray and allow to cool and set into a firm, brittle jelly. Once set, transfer to a blender and blitz until smooth. Season with salt and pass through a fine sieve into a squeezy bottle. Set aside in the fridge