Great message I don't think many understood the message of this movie... or I misunderstood it.
A great chef who started off by just making cheesburgers, rises up to be a well known, respected one by... well, rich people. What do rich people enjoy the best? Not the food but the bill. The arrogance of paying a big bill for 3 little splashes of grease on their plate.
"Chef" was the most happy when people ate his food and they would smile and fill their bellies with his tasty cheesburgers, only to see how rich people would take pride in throwing money away on nothing, without appreciating the actual food. He punished the rich guests for this as well as he punished himself for being fooled that "rising up" would bring him any satisfaction. He also punished the staff for wanting to become basically slaves to money and idiotic so called food.
The only one who understood him was the only poor girl who saw the pictures of the Chefs falling from happiness to being extremely miserable... so in the end she escaped due to one single simple thing: she made him smile. She degraded his expensive food and asked him to cook for her a simple and greasy cheesburger, made with simple and cheap ingredients. Once more he remembered his joy from when he was young and happy, from when he would smile. So, therefore, she was the only one to be let go and live. She understood everything in the end and did not let his cheesburger go to waste... so she ate it while watching the restaurant explode with everyone inside.
To me, the message was powerful. I hope others can understand it as well.