Is it a relish, or is it a pickle?
I don’t know, but it is a good way of using up surplus courgettes and is very tasty with cheese.
Grate about 1 kg of courgettes into juliennes. Add a red pepper, two red onions, one glove of garlic, perhaps an apple, all finely diced. Add two teaspoons of salt, mix well, cover and let rest for 24 hours.
On the second day, combine 300 ml cider or white wine vinegar, 200 ml water, 4 tablespoons caster sugar, two teaspoons turmeric, ground coriander and ground ginger each. Optionally add chilli for heat or a cinnamon stick for depth, and two or three star anise are never a mistake in my view.
Bring this to the boil, then reduce to a simmer. Drain the courgette mix and add to the hot liquor. Let it rest for 2..3 minutes, perhaps adding a little cornflower to thicken the liquid slightly.
Meanwhile stearilise jam jars in the oven at 140 C for 15 minutes, then fill with the hot relish, close the lid firmly, sterilise at 80 C for 20 minutes and let cool down.
