Place all the ingredients in a large bowl and mix well. Season well and shape into 4 large patties. Heat a dash of oil in a large frying pan over a medium heat (or heat a barbecue plate until hot) and place the patties on. Cook for 16-18 minutes, turning and cooking the sides as well until they are cooked through.
Mix together the yoghurt and mint. Soften pitas as per packet instructions or toast. Place salad leaves moistened with a little yoghurt and mint dressing into the pita, follow with the beef patty and a scattering of blue cheese. Serve with remaining yoghurt and mint dressing in a small bowl.
Recipe from recipes.co.nz