It has been adapted from a book which I found today and just HAD TO BUY - 'Green: modern vegetarian recipes' by Australian cook Flip Shelton. If you are wanting to make your own vegetable stock, you may want to combine the ideas here with another recipe. It's just that it could take a while to gather together the ingredients. As Flip says It's so easy to make your own stock - plus it's a great way to use up things like vegetable peel (other than potato), carrot tops and bottoms, onion skins and the skinny inner stalks of celery. Start by saving well-washed vegetable peel in a plastic bag in the freezer. Keep adding to the bag until you have enough to make this recipe. She doesn't mention making this in a crockpot, but this is where I'll be making it once I've got into the habit of saving the required ingredients.