As you know, a burger contains the 5 flavor nuances - sour, sweet, salty, bitter and umami and maybe that is why it is a favorite food all over the world. When the balance is perfect, it becomes gourmet and even art!!
The list is a mix of both expensive and cheap diners, take-aways, pop-ups and nicely decorated restaurants. Common to them all, however, is that they make unusually good burgers. Enjoy