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Sourdough Yeast Starter
This handwritten sourdough yeast starter reflects a practical, mid-century home baking method when commercial yeast was used sparingly and starters were carefully nurtured. The recipe includes both a classic flour-and-water starter and a potato-based variation, which was especially popular for producing a soft crumb and mild tang. Sugar jumpstarts fermentation, while daily feedings keep the culture active and strong. Ready in just a few days at room temperature, this starter would have lived on a kitchen counter, fed regularly, and shared among neighbors. Its simplicity, flexibility, and reliability made it a beloved foundation for everyday bread baking.
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Prep Time 10 minutes
Cook Time 0 minutes
Fermentation 5 days
Total Time 5 days 10 minutes
Course quick bread
Cuisine American
Servings 2 cups
Calories 60 kcal

Ingredients
  

For Sourdough – Yeast Starter

  • 6 cups warm water
  • 1 ½ tsp salt
  • 9 tbsp sugar
  • 1 tsp active dry yeast
  • 4 to 5 cups All-purpose flour (enough to make a paste, added gradually)

For Potato Starter (Variation)

  • 1 cup potato water (from boiled potatoes, cooled)
  • ½ tbsp sugar
  • ¼ tsp salt
  • 1 to 1 ½ cups All-purpose flour (enough to make a paste )

Instructions
 

Step 1: Mix Liquid Base

  • Combine warm water and salt in a large bowl.
  • Stir until salt dissolves.

Step 2: Activate Yeast

  • Add sugar and yeast to the water mixture.
  • Stir gently and let sit 5 minutes.

Step 3: Form Starter Paste

  • Add flour gradually, stirring until a thick paste forms.
  • The texture should resemble pancake batter.

Step 4: Begin Fermentation

  • Cover loosely and keep at room temperature.
  • Stir once daily.

Step 5: Feed the Starter

  • Each day, feed with 1 cup water, ½ tsp sugar, and enough flour to return to paste consistency.

Step 6: Use or Store

  • Starter is ready in 4–5 days when bubbly and active.
  • Refrigerate or continue daily feedings.

Step 7: Potato Starter Variation

  • Mix potato water, sugar, and salt.
  • Add flour to make a paste.
  • Feed and maintain the same way as above.

Tips

  • Use glass or ceramic containers for best fermentation
  • Feed daily at the same time for consistency
  • Use unbleached flour for stronger activity
  • Potato starter creates a softer, milder bread
  • Discard half before feeding if starter grows too large
  • Warmer rooms speed fermentation
  • Refrigerate if not baking weekly
  • Add a spoonful of starter to pancakes or waffles
  • Label jar with feeding date
  • Stir before measuring for recipes

Nutrition

Calories: 60kcalCarbohydrates: 12gProtein: 2gFat: 0.2gSodium: 95mgPotassium: 35mgFiber: 0.5gSugar: 2gCalcium: 8mgIron: 0.6mg
Keyword fermentation, from scratch, homemade bread, potato starter, sourdough, vintage baking, yeast starter