1kg celery, sliced
2 white onions, sliced
750ml white vinegar
750ml brown sugar, loosely packed
30ml/6tsp mustard seed
30ml/6tsp celery seed
10ml/2tsp grated ginger
7.5ml/1.5tsp turmeric
Bring vinegar and sugar to the boil. Add spices. Boil again. Steep celery and onions in hot vinegar for 20 minutes. Strain and keep liquid. Put solids in mason jars. Reduce liquid by half, then cover solids with reduction. Store in the fridge.