Marinated mushrooms with walnut and tahini yoghurt

This dish can work in endless contexts: with a few elegant endive (chicory) leaves stirred through, it will make a substantial vegetarian main course; as it is you can put it in a Tupperware container and take it on a picnic; or offer it alongside other salads as part of a smart spring buffet.

Shimeji are the clustered small mushrooms that you often get in ‘exotic’ selections.