6.6 La Demesure, 43 rue du Faubourg Montmartre in the 9th, 01.48.24.49.53 (although they never seemed to answer it), closed Saturday lunch and Sundays, (Metro: Le Peletier) has a sign out front like that of Ribouldingue, letters everywhichway. They have a spectacularly priced 2-course menu (14.50 E) but various other things on other cartes. I chose to go with the 14.50 and was quite happy.
I had two tartares in a row - a chunky, sushi/sashimi/quality salmon and a less chunky hand-cut beef with nice warm bread, fries and big leaves with a dressing that I swear was bacon-tinged. For dessert I had their lemon tart which tasted terrific although I suspect not house made.
My bill, with a 1/2 bottle of Bordeaux, their own house filtered water and no coffee (I was headed to Nescaffe), was 33.50 E this 67 E a couple.
Go: I'm not sure it's a destination but certainly alright for the occasion. dB= 77.9