Corn cakes with queso fresco with a bit of slow-cooked black beans. Try them in NYC at Rice near Houston Street, or at a restaurant near you that serves South American food. Delicious any time of year, and perfect now: healthy and filling.
Don't do without the portable and nicely spicy Bombay Burger if you're missing meat. Full of vegetables AND protein, vegetarian and gluten-free as well, of course. Buy the most firm and wrinkle-free eggplants you can find.
Read about other Lenten meal ideas.