Okay kiddo, have you heard of a chef? A chef is someone who can cook really well and make delicious food.
Now, a "grand maître de France" is like the king or queen of chefs in France! It's a very special title that is only given to the best chefs who have been cooking for a long time and have made many yummy dishes.
To become a grand maître de France, a chef has to impress a lot of other chefs who are also really good at cooking. They have to show that they can cook all sorts of different foods really well and make them look beautiful too.
Once they get this special title, the grand maître de France can wear a special hat and coat that show everyone how amazing they are at cooking. It's like a superhero costume for cooks!
So, the next time you see someone wearing a hat and coat with a special symbol on it, just remember that they might be a grand maître de France and that means they're a really, really good chef!