First, go here and get a sourdough starter (cost: two stamps, two envelopes. That’s what, a buck? Quit whining!)
Second, care for the starter for at least two weeks. After it’s grown up, pour off a cup, maybe a little bit more, and let it sit without feeding for a few days (to let the acids develop fully; this is important).
Third, go here and follow Mike’s recipe. Use the 1/2 cup of sugar.
Fourth, NOM NOM NOM!
No pictures. Eating. Go make your own!