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Heat the oil in a large flameproof casserole and cook all the vegetables with the chilli and ginger until soft.
Stir in the flour and cook for a few seconds. Dissolve the marmite in the boiling water and add gradually to the pan. Bring to the boil, stirring constantly. Add the mace, bay leaves and chestnuts.
Transfer to the oven and cook, covered, for 45-60 minutes until the chestnuts are tender. Adjust seasoning and garnish with parsley before serving.
posted by Mr Falafel