Yum! that bread baked around the stones would have been an edible soup-bowl. People would have also used their more traditional forage foods alongside the new techniques, e.g. cooking nettle tops in the spring makes a tasty green vegetable side dish even today, or adding a few large spoonfuls to soup in the last 10 minutes or so adds taste and nutrients. Collecting birch sap one spring is something I keep meaning to try after seeing it on Ray Mears.
Something is not right. This message is just to keep things from messing up down the road