High in fibre, a good source of iron and counts as 4 of your 5-a-day, this is the ideal healthy and warming winter dish
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Freeze the crumble in the dish before the final baking. Defrost overnight in the fridge, then bake as above.
Sachets of bouquet garni can be found in the supermarket, but you can easily make your own: tie together a couple of bay leaves and a small bunch each of rosemary and thyme with some fine string.