Courgettes are a good one to grow because they are really fast and produce a lot of food per plant - and they look pretty too. Once they get going each plant produces between 4 and 6 courgettes a day as long as one keeps picking them.
Courgette fritters, baked courgettes, stuffed courgettes, courgette moussaka, courgette bread, stuffed courgette flowers...
And the surplus feeds a lot of friends!