Preparing the vegetables for this stock is so easy that I do it as I'm putting the groceries away. In NZ celery is sold the right way, with all the leaves, so it's too long to go in my veg chiller drawer in the fridge. This stock uses all the top part of the celery, thereby solving a problem and not wasting any good food! It also has the added bonus of making you look like a domestic goddess. It makes about 2.5 litres of stock, which I freeze it small tubs so I always have stock on hand. Prep time is about 3 minutes and the rest is put-your-feet-up cooking time. Couldn't be easier.