Soak the frozen peas in hot water for 10 minutes, then drain.
Add the peas, mint sauce, chickpeas, onion, sunflower seeds, garlic and generous pinches of salt and pepper to a food processor and pulse the mixture until it reaches a rough consistency. Avoid processing the mixture too much because it will be harder to shape into patties.
Transfer the mixture to a mixing bowl. Add the breadcrumbs and mix together until everything is fully combined, then shape the mixture into 5 evenly shaped patties. If the patties aren’t quite holding their shape, simply add more breadcrumbs until they reach a firm enough texture.
Add a little oil to a frying pan. As soon as the oil is hot, add 2-3 patties to the pan at a time and fry for 5 minutes on each side, or until they become golden brown.
Build each burger using the burger buns, vegan mayonnaise, rocket, tomato chutney, tomato and red onion.
