29 May 2019 --- High-end UK grocer Waitrose & Partners has launched the first seitan based burger for the British market. The Seitan Pattie is a mix of seitan – a protein-rich food made from wheat gluten – and mushrooms, combined to give an intense smoky flavor. Suitable for barbecuing or being cooked in the oven, the product offers a solution for a complete vegan feast, according to the company and comes as summer and the barbecue season approaches.