When picking the elderflowers, make sure the umbels are free from insects. Discard any affected umbels.

Do not wash the umbels, as this will cause the pollen to be lost.

Remove the thick green stalks, leaving the thin flower stalks attached to the blossoms.

Place the flowers in a large, clean glass container.

Pour the Balsamico Bianco over the flowers whilst cold; there is no need to heat it. The maceration will start regardless.

Seal the container and leave to infuse in a dark place at room temperature for 3 weeks up to 6 months. The longer the infusion time, the more intense the flavour.

Strain the vinegar through a fine sieve or muslin cloth and pour into a clean bottle. Store in a cool, dark place.