I like to grow things that can double as an outdoor on the go snack. I have a sugar snap pea plant that I will never have to "harvest" because my teens snatch off every pea pod and eat them daily. Tiny tomatoes are another big hit. In the past we had raspberries and grapes, then we moved and I have yet to re-establish those.
Veggies taste better directly out of the garden. Peas in particular just slap when eaten right off the vine. Cherry tomatoes are good but nothing beats an heirloom... they look freaky compared to a beefstake but they soooo good!