A chilli’s heat is measured on the Scoville scale, a test created in 1912, in which the more water needed to dilute a chilli solution before a human taster can no longer detect the chilli determines the number of Scovilles. Today, testing is done by machines. A score of around 3,000 Scovilles is deemed hot, with record-breaking chillies such as 'Carolina Reaper' topping two million mark.

Many chilli varieties are available to buy in supermarkets but you will have a much greater range to choose from if you grow chillies yourself. They're very easy to grow from seed, and grow best in containers, which means they are perfect for a sunny patio or balcony. You can also buy ready-grown chilli plants at the garden centre in spring.