This is one of those "invented by error" recipes, and basically a Spring mistake. When I found there were still peas left on the plants when I was pulling them up in the late Spring, I saved them. You know the kind... we call them "square peas". There were just too many to throw away. I put them in the refrigerator, intending to deal with them later. They sprouted. I rinsed them and put them in a jar... rinsed them again... and they actually looked inticing, or maybe interesting. We eat a lot of chicken, so I frequently make chicken stock, and had some on hand. (We also grow shallots, onions, and garlic.) I do try to keep up with the peas, so this is not a frequent soup. Amounts are up to the discretion of the cook.