The botanical Sideritis is treasured in Greece as herbal tea. I love the description by tea companies of Sideritis scardica as 'self-grown', as opposed to a weed. Harvested from the mountainous regions, it grows wild on rocky cliffs, absorbing the rich, mineral-laden soil and hot air. A colleague brought back a packet and I confess I thought it would join the list of holiday drinks that tail to taste as good at home.

It is, however, worth seeking out. It is often consumed to boost immunity as it is rich in antioxidants, anti-inflammatory compounds and essential oils, making it a natural remedy for colds, respiratory issues and digestive problems.

How ro serve

Prepare by steeping dried stems, leaves and flowers in hot water. Enjoy it plain or with a drizzle of honey and a slice of lemon.

Where to buy

Oliveology at Borough Market, London SE1, 20g loose for £4 (020-7018 8858; www.oliveology.co.uk)

Jonathon Jones discovers teas from around the world, finds new flavours and cultivation techniques, and takes English tea to Asia.