In intl F class often there is no "vegetarian meal" but there is a vegetarian choice; e.g., When ordering for friends, I was told by AA that there were no vegetarian meals on flights to South America, but they found that there was a pasta option that had no meat served in Biz class.
Not true. Flew DFW - EZE last week and EZE-DFW today and there were vegetarian options available in J.
I preordered a regular dish that had no meat in it on the way out and special ordered a veg meal on the return.