So I bake sourdough breads -- which means I grow the yeast culture myself.
It's very easy, actually. You just need: an empty jar, some flour, some water, and time. If done correctly you should have a happy, bubbling little colony of yeast frothing away within a few days. Then you keep feeding it with some more flour and more water every few days.
I've discovered that bread baking is a pretty delicate art; a lot of different variables you can experiment with. Flour types, fluid/Flour ratio, salt content, proofing time, baking temperature, preferments or not, how long and in how many stages to knead the dough and let it rise.
It'll suffice to say that it's a satisfying little hobby that keeps on giving. I encourage everyone to try.
