Here's a recipe I acquired several years ago. I don’t recall where I got it and I don’t know what legal issues might arise should you decide to take up home distilling. No longer made with potatoes as it used to be, this recipe (I’ve been told) makes a wonderful “drop of the craytur”. It has many health benefits and people who drink it regularly have been known to live as old as forty.
You’ll note that there are no potatoes or barley in the recipe. Those ingredients, I’m told, went out of fashion in the late 1800s when sugar became relatively cheap.
The distilling process is complicated and requires no small degree of skill -- it also, of course, requires a still. But here’s the recipe:

7 lbs of bakers yeast
42 lbs of brown sugar
4 lbs of treacle
1 lb of hops

1. Steep ingredients in 3 gallons of lukewarm water at the bottom of a 40 gallon barrel after steeping fill barrel to three quarter full with cold spring water. Leave in a cool place to settle. After several weeks transfer to your still.

Here’s a video of traditional singer Tom Lenihan singing a paean to poteen, surrounded by a slew of beer drinkers ...
https://www.youtube.com/watch?v=-mMRMDogu2c