I happen to like poteen/potcheen IF it's well made.
MOST of the old 18th/19th century recipes are a mixture of barley/wheat/rye/oats, (sometimes) other grains and treacle (molasses).
(I've found a few old recipes that have up to 20% of cooked/mashed potatoes by volume.)
In the USA most commercial/illegal distillers quickly stopped making poteen with oats & potatoes, as in "commercial distillation" both oats & potatoes tend to scorch, if not constantly stirred & ruin the "beer".
(At least in the Southland, Irish/Scotch emigrants continued to use oats & potatoes in their "small batch" concoctions for home/farm use.)
A historical "family" note: Our family has been "blessed with" (or "cursed with", depending one one's viewpoint) some truly strong/independent women since the first members of the family emigrated to SC in the mid-1600s.
One of those strong women was Eithne Grainne (nee O'Meilly) Bankhead, a redheaded (and said to be beautiful) Irish hellion, who married into the family in 1847 & when her groom died about 10 years later, she took over the family liquor business & "ran things" with an iron hand for over five decades. = She is remembered for her fiery temper, hardheadedness, her devoutness to her Roman Catholic faith & her known propensity to use a knife,a gun & noose to protect home & hearth.= During TWBTS period, she reportedly hanged any number of "invaders", "spies", "line-crossers" & "outlaws" in her front door-yard.
(My mother's generation called her "Hag Eithne", as the older that she became the HARDER/MEANER that she was to "family enemies". - In her defense, I suspect that she HAD to be that way to survive as a widow, with 8 children, on the MS/TX frontier.- She lived to be 104YO.)