Sourdough Starter #4

This is the sourdough starter farm girls and trail cooks have been making for centuries: leftover potato water plus a little unbleached flour, nothing else. The starches and natural microbes from the potato water jumpstart fermentation faster than a flour-and-water starter alone.

The principle is straightforward. Boiling potatoes leaves you with cloudy, starchy water full of plant sugars. Mix that lukewarm water with enough flour to form a thick batter, leave it covered on the counter for a day or two, and wild yeasts from the air settle in and start eating. The result smells unmistakably of sourdough, with a tangy, almost beery aroma when it’s ready.

It’s a brilliant trick for anyone caught without commercial yeast, whether camping, snowed in, or just out of packets. Once the starter is alive, you maintain it like any other sourdough by feeding regularly with flour and water.

Kitchen Tips

• Save unsalted potato water. Salted water inhibits the wild yeasts you’re trying to recruit and can stall fermentation entirely.
• Use lukewarm water, not hot. Above about 110°F (43°C) and you start killing the very microbes you need.
• Cover with a clean cloth or loose lid, not airtight. The starter needs to breathe and let captured wild yeasts in.
• The starter is ready when it smells pleasantly tangy and shows visible bubbles. A bad smell (rotten, off, sharp like nail polish remover) means contamination and a fresh start.

Variations

• Use rye flour instead of unbleached for a faster, more aggressive starter. Rye is loaded with wild yeasts.
• Stir in a tablespoon of grape skins or organic raisins to introduce extra wild yeast from the fruit’s bloom.
• For a milder, sweeter starter, use water from boiled mild potatoes like Yukon Golds rather than russets.