5.2 Les Enfants Terribles, 63, rue Saint Maur in the 11th (no not that in the 8th or 12th), closed Sundays, was a serendipitous find; I was headed to 67 where was located both a restaurant/brasserie/bistro/bar which didn't look right and La Buvette where a photo shoot was clearly underway inside, so I mosied around the quartier until I fell upon Les Enfants Terribles which looked doable.
On the ardoise outside it said plate of the day osso buco formula 14 E and that met my needs, so in I popped; first I had oeufs mayo (maison) with some of the nicest mayo I've had in a long time, then genuine, but surely Metro osso buco with a wonderful peppery aftertaste and then a quite decent but again Metro I'm sure - creme brulee.
The bill, with a 1/2 bottle of a Cotes du Rhone and a coffee, was an easy 29 E.
Go? I wouldn't plan on it, but if forced, grin and bear it.