Several options. They have shops with premade sandwiches and salads.
If you are talking about within the airport there are tons of options, just depends on which gate you're in. But if you're looking for something near the airport there is Panevino an Italian restaurant with Vegan options about 3.5 miles from the airport. 246 via Antonio ave
Anywhere there is pretty quick. They have delis to fast food to restaurants. Take your pick
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