It's easy to get started creating your first loaf of sourdough bread. Just follow the steps here and you will be amazed at your results.
What is sourdough?
Sourdough is a dough containing wild yeast (Lactobacillus) culture in combination with yeasts. It is one of the principal means of natural leavening in bread baking. Other breads use cultivated forms of yeast (Saccharomyces). It is important in baking rye-based breads, where cultivated yeast does not produce comparable results. Compared to breads made with baker's yeast, naturally leaven breads produces a mildly sour taste because of the lactic acid produced by the lactobacilli.
Where can I get my own Sourdough Starter?
You have three obvious choices.
#1 Make it. This is my choice because it is #1 cheap, #2 easy and #3 all home made. Grow your own. The wild yeast that you need are already in your kitchen, there just really small, so you don't see them. The are little buggers. Yeast exists naturally in our environment. Look at a bunch of grapes in the produce department at your grocery store, that white dusty looking stuf you see on the grapes. Yep, Yeast. It is on the wheat that is ground into your flour. Wild yeast is just that, it's wild. So capture some with my simple method.
#2 Carls' Friends - Carl passed away in 2000 however his starter lives on. Go to http://carlsfriends.net/ and follow the instructions. For the cost of sending them a stamped self addressed envelope they will send you a dried starter of Carls 1847 Oregon Trail Sourdough Starter. Instructions are on the website.
#3 Amazon.com There is plenty of people selling sourdough starter.