Step 1

Pinch off about ¼ cup of sourdough and place in a glass jar or non-reactive container.

Step 2

With a fork work in 1 cup of flour or more until the dough is very stiff, dry, and crumbly. Heap some more flour on top.

Step 3

Place a lid on the jar and place the sourdough starter in the refrigerator.

Step 4

The evening before you want to bake, take the jar out of the refrigerator.

Step 5

Add some filtered or distilled water to it. With a fork, stir the water into the sourdough starter until you have a thick consistency. Don't worry about any remaining clump.

Step 6

Let this mixture sit out at room temperature until the next morning.

Step 7

Use your active sourdough starter according to the recipe.

Step 8

Don't forget to keep back ¼ cup of starter to repeat the process.