Sourdough Starter from Scratch

Ingredients

Equipment Needed

• •Digital kitchen scale (essential for consistency)
• •Wide-mouth glass quart jar or similar container
• •Wooden spoon or silicone spatula
• •Rubber band or tape for marking rise
• •Clean cloth or loose-fitting lid

Instructions

1. 1

   Day 1: The Beginning

   Weigh 100g (3/4 cup) flour into a clean glass jar. Add 100g (scant 1/2 cup) room-temperature water. Stir vigorously with a wooden spoon or spatula until no dry flour remains. The mixture should resemble thick pancake batter. Scrape down the sides of the jar, cover loosely with a cloth or lid set ajar, and mark the level with a rubber band. Place in a warm spot, ideally 70-75°F. Walk away. You're done for today.

   Use a clear glass jar so you can observe the bubbles forming inside. A wide-mouth quart jar works perfectly.
2. 2

   Day 2: First Signs

   Check your mixture. You may see a few small bubbles on the surface or along the sides of the jar. You may see nothing at all. Both are normal. Discard half of the mixture (approximately 100g) and add 100g fresh flour and 100g water. Stir well, scrape the sides clean, replace the rubber band at the new level, and cover loosely again. The discard goes in the trash for now. Don't feel guilty. This is how we concentrate the developing culture.

   The discard prevents your starter from becoming too acidic and helps maintain the proper ratio of food to organisms.
3. 3

   Days 3-4: Awakening

   Continue the same routine: discard half, feed with 100g flour and 100g water, stir vigorously, mark the level. By day three or four, you should notice increased activity. More bubbles. A slightly tangy smell replacing the raw flour scent. The mixture may rise slightly between feedings. You might see a burst of activity followed by collapse. This is the wild bacteria establishing themselves. It looks like progress, and it is, but your starter isn't ready yet.

   If your kitchen runs cold (below 68°F), place the jar on top of your refrigerator or near a warm appliance. Fermentation slows dramatically in cool temperatures.
4. 4

   Days 5-6: Building Strength

   The starter should now be reliably bubbly, with a pleasant sour smell like yogurt or mild vinegar. It should roughly double in size between feedings, rising up in the jar and then falling back as it exhausts its food supply. The texture becomes more airy and spongy. Keep feeding at the same ratio. Twice-daily feedings (every 12 hours) can speed development if your starter seems sluggish, but once daily is usually sufficient.

   A dark liquid (hooch) forming on top indicates your starter is hungry. It's not harmful. Just stir it back in or pour it off, then feed immediately.
5. 5

   Day 7: The Float Test

   Your starter should now be vigorous: doubling within 4-6 hours of feeding, full of bubbles throughout, domed on top at its peak. The aroma should be pleasantly sour with hints of overripe fruit or mild cheese. To confirm readiness, perform the float test. Drop a small spoonful of starter into a glass of room-temperature water. If it floats, your starter is active enough to leaven bread. If it sinks, continue feeding for another day or two.

   Perform the float test when your starter is at its peak, usually 4-8 hours after feeding. A sunken starter tested too early or too late will give false negatives.
6. 6

   Ongoing Maintenance

   Once established, your starter requires less attention. For weekly baking, keep it at room temperature and feed daily. For occasional baking, store it in the refrigerator and feed once a week. Before baking, remove it from the fridge, discard and feed, and let it return to peak activity at room temperature. This usually takes 8-12 hours or two feeding cycles. A well-maintained starter will last indefinitely. It becomes more stable and flavorful with age.

   Name your starter. It sounds foolish until you've kept one alive for a year. Then it sounds like common sense.

Chef Tips

• •Chlorinated tap water can inhibit fermentation. Use filtered water, bottled spring water, or let tap water sit uncovered overnight to off-gas the chlorine.
• •Whole grain flours (whole wheat, rye) contain more wild yeast and nutrients than white flour. Adding even 25% whole grain to your feedings can jumpstart a sluggish culture.
• •Temperature controls everything. At 75-80°F, fermentation races along. At 65°F, it crawls. Find the warm spots in your kitchen: top of the refrigerator, inside the oven with just the light on, near a heating vent.
• •Save your discard once the starter is established. It makes excellent pancakes, waffles, crackers, and pizza dough. Nothing goes to waste in a proper kitchen.
• •If your starter develops pink, orange, or fuzzy mold, discard it and start over. This is rare but indicates contamination. The normal colors are white, beige, and occasionally grayish on top.

Advance Preparation

• •Once mature, starter can be refrigerated for up to two weeks between feedings, though weekly is ideal.
• •To revive a neglected refrigerated starter, discard all but 50g and feed twice daily for 2-3 days until activity returns.
• •Dried starter flakes can be created as backup by spreading thin layers on parchment and air-drying completely. Store in an airtight container indefinitely and rehydrate with equal parts flour and water to restart.

Frequently Asked Questions

Nutrition Information

1 serving (about 15g)