The last time I have made this courgette salad recipe I did use frozen chopped courgette/ zucchinis which I greedily buy sometimes and realise all of a sudden I have too many of. I was also going on holiday so I did freeze the remaining ones for later use. By freezing them you will prevent waste but it also preserves the quality and freshness. Frozen courgettes will taste amazing but I definitely recommend cooking them straight from frozen and not attempt defrosting them.