Szechuan pepper is not technically a pepper but a dried berry that creates a unique tingling, numbing sensation on the tongue known as 'má' in Chinese cuisine. This effect comes from a compound called hydroxy-alpha-sanshool, which stimulates nerve endings in a way no other spice does. When using Szechuan pepper, restraint is essential — too much overwhelms the palate and masks other flavours entirely. Toast the peppercorns briefly in a dry pan before grinding to intensify their citrusy, floral aroma. In chilli oil, Szechuan pepper provides the distinctive mouth-tingling quality that distinguishes great chilli oil from merely hot sauces. Combine carefully with other heat sources for balanced, layered spiciness.