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Essdras M Suarez/Globe Staff; food styling/Sheryl Julian and Jaclyn Fishman

Makes 1 cup or enough to make 3 baguettes, 15 small rolls, or 12 biscuits

Establishing a sourdough culture takes about a week, and requires daily feedings of equal parts flour and water. Vigorously stirring twice each day strengthens a new starter, helping the naturally-occurring yeasts to multiply.

2cups flour
2cups water

1. In a large canning jar with a wide mouth, combine ½ cup flour and ½ cup water. Stir well. Cover tightly and set on the counter for 24 hours.

2. Stir well, then discard all but ½ cup starter. Add ¼ cup flour and ¼ cup water. Stir well, cover tightly, and set aside at room temperature for 24 hours, stirring twice during that time. Repeat the discarding and adding process every 24 hours for 7 days. Once the starter is bubbly, thick, with a yeasty and slightly sour scent, it’s ready to use.

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3. If you use it often, store starter at room temperature and feed daily; instead of discarding some of the starter, remove what you need to make the recipe from the jar. Feed the remaining starter as before, using ¼ cup flour and ¼ cup water.

4. If you don’t plan to use it often, store the starter in the fridge and feed it weekly. Remove from fridge and feed at room temperature for 1 day before using. Discard if any mold appears. If you’re going on vacation or won’t be baking, you can store the starter in the freezer indefinitely. Thaw it at room temperature, and feed it for 2 days to wake it up.

Jaclyn Fishman

Recipes:

- Do-it-yourself sourdough

- Recipe for sourdough biscuits

- Recipe for sourdough baguettes