Pierre Sang (Boyer) in Oberkampf is the offshooter of the (Atelier) Pierre Sang on Gambey where I had a great meal recently and I asked a friend to make reservations which he emailed he'd "done"; however when we arrived they said just now we're cleaning up, go to the corner....the mother ship....and my heart sank; the last Sunday I'd been to the parent, there were no reservations, you had to be in line by midi pile to get in and you usually sat at the counter, gathering your food from the basement where sumptuous leftovers were arrayed. Unh, unh, no more - but... his reservation was clearly written down, we were offered counter stools upstairs or a table downstairs which had no more leftover counter but more tables, inside a spaceship decorated cave and quite nice seating except the hard bench should have had a cushion.
All four of us went with the 3-course 25 E no choice (except for those allergic, phobic or disgusted by some items) "menu" (there is one with 7 courses, that's quite a few mouthfuls). Our first was clearly a couple of nice pieces of fish - daurade, lieu, no lotte, sure lotte?; "no" said the true distinguisher, and indeed it turned out to be carrelet aka European place fish, dab or plié but it was nicely crisped on the bed of celery puree (we all got that wrong, salsify and fennel - the second course a large beef shortrib (easy to spot) with "hot" the waiter warned us sauce, but it was not scorching to Anglos; and a multi-scooped pineapple, cream and bready dessert.
Our bill, with 3 bottles of wine, 3 coffees, very good bread and butter and no bottled water, was 108.50 E, but back-packers could just have the 25 E 3-course "menu" and be very happy, as were we. But one must reserve, the place is packed and turns tables over.