I called LTT about this not too long ago and was told to just let them know when I checked in. Honestly, I forget what exactly prompted me to call because I've never had a problem getting a vegetarian meal at WDW..... If your request is more specific or there are allergies involved, I'd call ahead of time, maybe the day before, and ask to talk to the chef to see what they can do. WDW chefs do a very good job on veg food, so I wouldn't worry too much.
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