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Melt the butter in a large pan, add the onions and courgettes, and cook for 5 mins on a medium heat, stirring occasionally.
Add the tomatoes and flour. Cook for a couple of mins, stirring around to stop the flour from becoming lumpy. Add the turmeric and stock, cover and simmer for 30 mins.
Purée with a stick blender, then sieve if you want a really smooth texture. Serve hot with crusty bread, if you like, or chill, then freeze for up to 2 months.