There are lots of foraged foods that require more preparation than just regular cooking. I wouldn't be surprised if someone, either upon tasting the bitterness,

There are lots of foraged foods that require more preparation than just regular cooking. I wouldn't be surprised if someone, either upon tasting the bitterness, or getting sick just one time, figured that they should try soaking, or double boiling, or some other technique that they probably have used for other foods.