Great question — answering as the UphillTech team:
These TGVs have a different menu to the regular domestic French TGVs! The menu is branded as "b2in", and features the logos of both SNCF and RENFE on it: A pdf of the menu can be found here on the Elipsos site - if that isn't the exact one as found on the TGV last weekend then it's very very close to that! It largely contain the same kinds of things as the regular TGV menu, just many of the items are more spanish influenced. For example, they have Spanish beers, and one of the sandwiches features Jamon Iberico. French options were equally present, but most people seemed to be ordering Spanish things out of preference whenever I happened to be in the bar to see. Quality wise - seemed OK, but...
Full answer by Gagravarr: https://travel.stackexchange.com/a/36077 (CC BY-SA 3.0).
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