Honestly, the quiche lorraine at Chefs de France is fairly tame.
It's a mixture of eggs and cream with bacon and cheese in it (I think CdF uses gruyere? Mild sweet and salty cheese, not like bleu or roquefort or even sharp cheddar). Some restaurants put onion in there (which techincally is a quiche alsacienne, but many still call it lorraine), I don't think CdF does. The crust is little more than a half-half mixture of flour and butter, and doesn't have much flavor of its own.
If you like bacon omelets, you will not be very surprised with anything you'll find in quiche lorraine. The texture is a bit firmer than an omelet, that's about all.