I too have eaten fresh water messels, and crawdads. Both were terrible! I am sure that both would taste much better with a little more effort than I gave it, and a "survival appetite". Dandelion greens seem good to me, but I always drain the first boil water, then add new water and bring to a simmer. It seems to rid most of the bitterness, and some salt&pepper helps out, too.
"Remember the Alamo"!