So…let me preface this by saying I’m not dumping on your post. That being said…
There is no quick replacement for a good sourdough starter. The brands you may be familiar with that have that extra sour taste are working from mothers that are a hundred years old or more, and it’s really easy to tell the difference between TRUE sourdough, and a new mother starter.
The beer thing is a bit of a hack, but it’s still not going to taste great because all you’re getting in the finished flavor is baked yeast. If people want that, they can just add more yeast to their bread mixes, but everyone already knows that doesn’t work.
This sort of technique has been used for a long time in things like Irish Soda Bread, Mead Bread, and Nordic breads. The problem with it is that that initial introduction of alcohol (if using) will kill the active yeast that is responsible for a good rising and crumb. You’ll just end up with a dense bread that burns (you can see it in your picture).
A better shortcut to this sort of flavor without the flatness in the finished product is infusing the bottom of the barrel malt/yeast sludge into a fat like olive or vegetable oil, then adding that to your dough. It won’t kill the active yeast, and you’ll still get the sour notes.
It’s no substitute for an aged started mother, but it’s probably better than just dumping beer into dough.
👍
Harbor Innovations, the Paper 7 maker? Damn, I was just starting to get interested in trying one out.