"Lordy, how delicious! Eatin' goober peas." The Civil War song "Goober Peas" about peanuts was sung on both sides by hungry troops.
Lorena was sung by troops on both sides as they longed for home and their sweethearts. Any Foster songs, esp. "Hard Times."
The song "White Potatoes," written by a tenant farmer who lived through the great famine, and set to music by Paddy Moloney, is on the cd "Long Journey Home" from the "Irish in America" project. An excellent song about the famine that killed or exiled so many.