Here it is!
Make a brine with 150g rock salt and 1.5L water, dissolve salt well
Finely chop (think piccalilli size veg) 1.5kg of veg - 2-300g each green tomatoes, cabbage, cauliflower, red/green peppers, mooli (daikon), onion.
Immerse the veg in the brine overnight - use a plate to press down...