Since I imagine the cow icon has become identifiable as your company, I wanted to keep the recognition of your old logo, but resolve the issue that people think you sell beef. My idea here is to have a burger cutout of the cow. That way both the burgers and the cow play an equal role in the message of "fresh hamburgers". Please let me know if there are any revisions, you would like to see or suggestion you may want to make to improve on this idea. :)