The dressing for this salad gets better as it sits, so you can do this hours before you want to use it This summer salad is always better with organic courgettes Credit : Haarala Hamilton Diana Henry The Telegraph's award-winning cookery writer Diana Henry is the Telegraph’s much-loved cookery writer. She shares recipes each week, for everything from speedy family dinners to special menus that friends will remember for months. She is also a regular broadcaster on BBC Radio 4, and her journalism and recipe books, including Simple and How to Eat a Peach, are multi-award-winning. A mother of two sons, Diana can satisfy even the fussiest of eaters.    See more Published 22 May 2026 1:01pm BST You need good courgettes for this, organic ones always taste better to me. If you have a friend who grows them, get on the phone and beg for some. The onions are a simple component but you could leave them out if you want to simplify things further.…