Weigh 4 oz unfed sourdough starter into a clean container. Discard the extra starter (see note)
Add 4 oz all purpose flour and 4 oz water and mix until combined. Set aside at room temperature.
The starter is ready to use when it has doubled in volume and a small spoonful floats when dropped into a bowl of water. This generally takes 4-5 hours but the time can vary based on dough temperature and room temperature.
If you do not plan to bake with the starter on the day it is fed, refrigerate 3-4 hours after feeding.
Feed refrigerated starter weekly. If you go longer than a week without feeding, you may want to give the starter two feedings before using.
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Notes
If you keep a small starter use 1oz of starter, 1 oz of water and 1 oz of flour. Check out these recipes that use sourdough discard if you don't want to throw it away.