An aphrodisiac jam containing ‘natural Viagra’ has been created for Valentine’s Day.

Manchester-based supplier F Duerr & Sons, which has been producing preserves since 1881, has used strawberries, champagne and horny goat weed in the jam. It is being produced in small batches and sold online for £4.99 – marking the first time the Duerr’s site has been transactional.

“We’re well known for preserving tradition through our recipes; however until now little has been known about our dedication to preserving romance,” said the company’s Richard Duerr. “We suggest you spread the love liberally on toast.”

Duerr’s said horny goatweed was a natural male sexual stimulant that had been used by practitioners for more than 2,000 years to boost erectile function and increase libido. It was first described in ancient classical Chinese medicinal texts and is today sold as a health supplement, usually in raw herb, tablet, or capsule.