Sourdough Bread Starter - cooking recipe

Ingredients

1 (1 tablespoon) package dry yeast
2 1/2 cups water
2 cups flour
1 tablespoon sugar

Preparation

Dissolve yeast in 1/2 cup warm water, rest for ten minutes.
Mix in flour, sugar& remaining water.
Allow to stand, loosely covered, in a warm place for 3 or 4 days. Use a large (preferably ceramic) bowl as it will rise considerably.
Every time the batter is used to make a product set aside 1 cup to be used as a\"starter\" for another batch.
Keep covered in the fridge (a pint jar works nicely).
To make it into a basic batter again, add another 2 cups flour& 2 cups warm water and allow to stand at room temp overnight It is now ready to use, but again reserve a cup of the starter.