Chop the mango flesh into a big pan.
Boil the vinegar and sugar to make a light syrup.
Blitz the chillies (seeds and all), ginger and dates up to make a thick paste. Add a bit of water to the blender if necessary – it will boil off in the final cooking.
Add the vinegar syrup and chilli mixture to the mango.
Heat and simmer gently until thick and a dark burnished gold. This can take a few hours. Sunday’s batch took about 3 and half hours. Take care the chutney doesn’t catch and burn on the bottom of the pan.
When ready, jar up in sterilised jars.
Wait.