I am a cook and I like to give some suggestions to improve the quality and innovation to the image of food. Not saying with this is that your bad. Quite the contrary. Knowing all of us, that your brand will prevail in our mouths many years and is based mainly on bread with burger. But when I look back will I see that many parents no longer want to simply repeat the past, rather, are somewhat saturated with the image. They also know that "eat" the image. All this to give some meaning to my suggestion and my suggestion is not in the taste but in the image. The traditional should be maintained, of course, but one could make a gourmet dish to cover more high society to innovate and encourage former client back.
Looking to the future
I hope my opnion be useful
Note: many more suggestions can be acquired