Add all ingredients into a big bowl. the best way to do this is with your hands. Scrunch the mixture together really well, then divide into 6 equal balls for burgers.
Wet your hands and roll the balls into burger-shaped patties about 2cm thick.
Place your burgers on the oiled baking tray and pat with a little olive oil. Cover them with cling film and put the tray into the fridge for at least an hour, or until the patties firm up.
Put some oil into a frying pan or griddle pan, put it on a high heat and fry for 3 or 4 minutes per side.
Cut buns in half, layer with butter lettuce, gherkin, tomato, red onion, sauce of choice, cheese and avocado.Reprinted with permission of Jamie from LoveFoodKitchen. To see more recipes, click here.