Slice the courgettes into 1cm thick round pieces and grill them both sides for approx. 3 minutes each side. Allow them to cool. Once cool put them in a glass tray (approx. 25cm long and 5 cm height). Cover the courgettes with a blend of 50% olive oil and 50% Extra Virgin olive oil.
Add the vinegar the fresh mint, chilli and salt. Mix well, place cling-film on top and allow to marinate in the fridge for 24 hours. Every couple of hours, just mix to make sure that all courgettes are well marinated.