When I first started baking sourdough with Yeaston, my starter, I thought fermentation was just something that happened while I waited. I didn't really understand it. I'd mix my dough, leave it alone for a few hours, and hope it worked out. Spoiler alert: it didn't always work out. My loaves were dense and kind of sad looking. Then my mom sat me down and explained what was actually happening inside my dough, and everything changed.
Fermentation is basically when the yeast and bacteria in your starter eat the flour and create gas bubbles and flavor. It's alive and working the whole time. The longer you let it happen, the better your bread tastes and the better it rises. This is why timing matters so much in sourdough, and why I can't just bake whenever I feel like it.
Living in Las Vegas makes fermentation tricky because it's super hot here. My dough ferments way faster than the recipes say because of the heat. During bulk fermentation, which is when you let your dough rest after mixing, I have to watch it really carefully. My mom taught me to do these things called stretch-and-folds every thirty minutes or so. Basically, I wet my hand and stretch one side of the dough up and fold it over itself. I do this four times around the dough. It's not just for fun, it's actually helping develop the gluten and redistribute the yeast and bacteria so fermentation happens evenly.
I learned that if I don't pay attention to fermentation timing, my oven spring suffers. Oven spring is when your bread suddenly puffs up in the oven from the heat. If your dough is over-fermented, it's already done expanding and your loaf looks flat. If it's under-fermented, it won't have enough gas to pop in the oven. Getting it just right is honestly the hardest part of sourdough baking.
The crazy thing is that fermentation also creates the flavor. The longer my dough ferments, the more sour and complex it tastes. My regular customers always ask me how I get that tangy flavor, and it's because I let Yeaston and his bacteria do their thing for long enough. I usually let my dough bulk ferment for four to six hours depending on the temperature, then I shape it and do a cold overnight fermentation in the fridge. That cold time lets even more flavor develop.
Understanding fermentation changed how I bake. Now I'm not just following steps. I'm actually thinking about what's happening to my dough and why it matters. That's what makes sourdough so cool, and I'm grateful my mom took the time to teach me.
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