I have to say without a doubt, my own biased opinion is no one knows how to make a tasty burger like the Europeans - tasty and healthy to boot - have you ever been to a McDonald's outside of the US... YUMMMMMMMMM
Aside from the fast food feeding frenzy that the US exports and like the Japanese, the Europeans improve upon, another biased note - the Portuguese burger

even better
On a trip to Portugal last summer in August, I ventured to my old childhood haunts in the Algarve and came upon a long-lost love.... Portuguese burger formula, a dash finely diced bread crumbs from a portuguese style baguette, chopped onion, salt, pepper and the ultimate beaten egg yolk (for all the children who hated eggs this was a grandma secret to get them to eat eggs anyway

Nothing beats, the sand under your feet, a sunny beach, umbrella, and a cheesy yummy burger with the best bread on the Western European seaboard - nothing out of you Frenchie...!!!