Peel the ginger then slice it into thin strips.
Slice the chilli into matchstick strips.
Heat ginger, chilli, sugar and vinegar in a small pan to simmering point and stir for 5 minutes. Turn off the heat and let it cool.
Cut the chicory leaves in half and thinly slice the stem. Put these in a sieve, scatter the salt all over them and rest for a couple of hours, mixing them regularly. Put the sieve over a bowl or the sink to allow the liquid to drain.
Drain the chicory, then mix with the syrup and transfer to a sterilised jar.
Chill for at least 24 hours before serving.
Store it in the fridge.