There's sourdough and sourdough.

Some cultures are nuts. I went on a baking course and used a sourdough starter from San Francisco that was over 100 years old.

It was an intense taste to say the least. Pretty vile, really.

After we ate some, the tutor said it was found to contain human spit enzyme.

I kid yee not!

Home made white flour sourdough really doesn't have that much taste lest you start getting adventurous.

Current weapon. Not expensive but it is quite good.