Soak the sundried tomatoes, dates and walnuts overnight. The tomatoes and dates can be soaked together, but the walnuts should be separate. In the morning, drain it all, reserving the soaking water of the tomatoes and dates.
Purée the carrot, celery, garlic, rosemary, chilli, oil and basil together with the soaked tomatoes. Then blend the walnuts and dates together to a rough consistency and mix the two mixtures. Thin this out with 200ml of the reserved soaking liquid.
Spiralise the courgettes, and mix with the bolognese. Add the olives and tomatoes, and season to taste. Serve, garnishing with micro basil.