Heat the olive oil in a frying pan and gently fry the onions for about 10 minutes until pale and soft, then leave to cool a little.
Finely chop the spinach and add the cooled onion, flour, spices and beans and mash together. Add the beaten egg, a little at a time (you may not need all of it), until the mixture holds together (add more flour if mixture is too runny or crumbly). Stir through peas and corn.
Divide mixture into eight medium-sized burgers and place on a prepared barbeque grill or oiled frypan over medium heat.
Grill or fry for about five minutes each side until browned all over. Serve in the crusty bread rolls,
with a couple of slices of tomato, Tasmanian cheese, tomato sauce and fresh salad on the side.