I kept this sourdough starter going for years when my children were younger, and they loved the bread I made with it. I found the recipe recently and decided to revive it.
I am also posting the bread recipe that goes with it.
On day 1, stir together the sugar, hot water, potato flakes and yeast, and place in a scrupulously clean ceramic crock or large glass jar. Cover with 3-4 layers of cheesecloth and secure with large rubber band. Let set for 5 days at room temperature. This may take only 3-4 days in very warm weather.
On the 5th day, stir in the 1 cup hot water, sugar, and potato flakes. Cover and allow to set 3-5 more days. You should smell a nice sourdough aroma. Stir it down and use for baking breads.
When baking bread, always feed the remaining starter to keep it fresh and growing. Remove 1 1/2 cups of the starter for your bread, and replace it with 1 cup hot water, 3/4 cup sugar, and 3 tablespoons potato flakes each time you use it. Cover and let set at room temperature for 24 hours, then refrigerate and save for your baking. Feed it every 5-7 days. You may replace the cheesecloth with a LOOSE-fitting lid once you refrigerate it, but do not use a tight fitting lid. The sourdough starter creates gases that must have room to breathe.