Nandos is an established company that knows what it's doing, as evidenced by its longevity and countless branches. People trust Nando’s decisions. So if Nando’s does something that initially looks weird, people will continue to support them. This references the slang “Let him cook” which means to let someone continue what may look/sound weird and unpopular as they’re onto something. Nando’s is also known for having a warm and friendly appearance, whilst maintaining a refined look. It links to the slang term “serve looks” which means looking good.