You wanna look at sprouting seeds
@Suki813 ...fast cheap turn around and full nutitional value.
You could Probably Interest the Child grow slave....
..jam jars...sprinkle on everything...the kids might be more interested if they can grow them.
Bean shoots for stir fry/salads take about 4 days in my hot season....water in twice a day....no Light Needed...just about the time a child wants to wait for something to grow....