Tarte flambée

If there's one dish that symbolizes conviviality, celebration and sharing in Alsace, it's the Tarte Flambée (or Flammekueche). Contrary to its French name, it's not flambéed with alcohol (like a crêpe), but cooked "à la flamme". It's the dish par excellence for groups of friends and large gatherings.
But what is it?

The traditional tarte flambée is based on a trinity of simple but highly effective ingredients:

Bread dough rolled out extremely thin.

A base of heavy cream (or a mixture of cream and fromage blanc called Bibeleskaes), lightly seasoned with salt, pepper and a hint of nutmeg.

A generous garnish of smoked bacon and finely sliced onions.