Welcome, cera.
Here are the ingredients you'll need to made vegetable stock concentrate:
http://www.recipecommunity.com.au/node/17315It's a very flexible list though - once you get going, just use whatever is on hand.
You use a lot of fresh herbs, spices, ginger, chilli, arborio rice, cream cheese, Parmesan cheese, fruit and veges.
You might use more than usual of items like buckwheat and quinoa.
If you make your own butter, you will be using up buttermilk.
The sky's the limit - so many wonderful things to make. Enjoy!