2-3 hour layover DFW Airport

Hello,

I live in Austin and might meet my folks as they have a 2/3 hour layover (3:30 - 6:30 on a weekday). Not familar with the area, and seeking advice on a place to grab a bite. My dad's vegetarian and likes Mexican (especially chile rellenos), Italian, and buffets. Nothing fancy - we're simple folk.

I realize the timing might limit choices - as some places close at that time.

Thanks,
Anj