Prepare the horseradish: Peel and grate 50g of freshly dug horseradish root. Pack it into a large, sterilised jar along with 2 finely chopped shallots, 1 tsp sugar, and ½ tsp salt.
Add the vinegar: Heat 600ml cider vinegar just below boiling point, then pour it over the horseradish mixture.
Seal and wait: Seal the jar and leave it for about a month to steep.
Strain and bottle: After a month, strain out the solids and bottle the flavoured vinegar.
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