Cook the spinach in a heated frying pan until wilted in its own juices. Transfer to a colander and squeeze out any excess liquid. Place in a blender and blitz to a pur6e. Transfer to a bowl. Add the ricotta, egg, flour and parmesan, season with salt, pepper, and nutmeg and stir. (If it’s too dry add 2 tablespoons of cold water.) Cover with clingfilm and refrigerate for 1 hour.
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