Cut the eggplant in to slices and sprinkle over the salt. Leave to sit for around 3-5min until liquid droplets form on top. Meanwhile, lightly toast the mustard and cumin seeds then grind them along with the fenugreek seeds, pepper and chili.

Warm the oil in a skillet/frying pan and as it warms, wipe the salt off the eggplant slices and pat dry. Cut the slices into a medium-small dice then add them to the pan. Cook, stirring now and then until soft, around 10minutes, adding the crushed garlic after around 5min. Don't worry if they stick now and then, just scrape off as best you can, but don't let them burn.

Once the eggplant is soft and almost cooked through, add the turmeric, stir so it coats everything and cook for another minute.

Add the spice mix, vinegar and sugar and mix well so the sugar dissolves. Cook another couple minutes, scraping anything that had stuck to the bottom, until the liquid has basically disappeared. Remove from heat and allow to cool before serving or storing in a jar in the fridge.