re: What do you look for in a great burger?

Best burger I've had in the last year was in Paris, of all places. Big Fernand is a hipsterish burger purveyor, but despite the Brooklynish pretense, the product is damn good. I had a "Le Victor"--veal patty, Fourme d'Ambert cheese, onion confit, etc. Damn was it good, and the ideal sesame-seeded bun, not too soft, not too squishy, but not tough or overly crunchy. Managed to try bites of the beef and lamb burgers as well; all were excellent enough to make me wish this place was down the street from my house.

Menu here, in french: LINK