This satisfying evening meal can be made in advance: simply make up the pie and freeze until you are ready to bake it
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How to make a bouquet garni
You can buy bouquet garni sachets alongside the dried herbs in the supermarket and they are perfectly fine to use. But if you have some herbs in your garden gather a sprig each of marjoram, thyme, rosemary, bay and parsley and tie into a bundle with kitchen string.