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To make the courgette purée, cut each courgette in half lengthways, then cut in half lengthways again. Use a paring knife, cut the seeds away from the flesh and reserve for later. Cut across the remaining seedless batons to make thin slices. Bring a pan of salted water to the boil, add the courgette slices and cook for a few seconds, until soft. Add the basil, cooking until it starts to break down, then add the spinach and bring to a simmer. Drain into a colander, pressing the ingredients to extract as much liquid as possible