I am too curious, found this tidbit: During the Civil War battle of Vicksburg, Northern troops laid siege to the town for 40 days. The Union army raided all the food supplies and burned everything else.
They left the black-eyed peas because they thought the peas were weeds. At that time they were called "cowpeas" and were mainly used to feed cattle.
With no supplies coming in, the citizens suffered great deprivation. There wasn't anything to eat. In desperation, they ate those humble "cowpeas" and felt lucky just to have survived the war.