Something simple, old fashioned and a little bit nerdy: good ol' grilled (Spider)-Ham & cheese sandwich on white, baby carrots, & an ironically named 'Twinkie' for dessert, and a healthy supply of 60s era approved Tang (the Orange drink of super-scientists, jet pilots, and Astro-Men) to wash it down. Not that Peter ever has time to eat lunch, constantly using lunchtime to fight crime, just in time to get to his next class before he is outed as Spidey!