Sourdough – What is the White Powder on Sourdough Bread?

Sourdough bread is bread that has been all or partially risen with the help of wild yeast. It is made sour because of wild lactobacilli that are picked up with the wild yeast. Where the yeast eat sugar and produce CO2 for rising- the bacteria create acid and other compounds that make the bread sour and distinctly flavored.

Because of the wild nature of the microbes, the bread will taste a little different in every place that it is made. The lactobacillus that gives San Fransisco sourdough bread its characteristic flavor is actually named Lactobacillus sanfranciscensis.

The starter can be a hassle to make and to keep. It requires almost daily attention to feed it and can waste a fair amount of flour unless you bake bread frequently. You can freeze the starter but it will require a few days of feeding before it can be used again. Many baked recipes besides bread are also delicious with sourdough starter. Sourdough waffles or coffeecake are fantastic.

Whether it is worth the effort is a personal decision. Many people don't like the flavor and you would have to love the flavor enough to make almost every bread with that flavor to justify the starter upkeep. Personally- I used to keep a starter but my kids don't like the flavor and I got tired of all my bread tasting the same. I just buy a loaf for the 2-3 times a year that I am craving a Reuben sandwich.

Without seeing the loaves or knowing your exact procedures, it's hard to guess. My money would be on too dry a dough. Could also be inactive starter, too long a bake, not a hot enough bake, not enough rise time/temperature. So I'll just talk about how I make sourdough in the hopes it'll help. These are techniques I've learned from various books (most notably Reinhart's The Bread Baker's Apprentice) and experiences.

If I did it right, you can click any of the thumbnails for full size images.

First order of business, of course, is having a nice, active starter. I build my final starter from the barm the day before. Depending on my schedule, I either leave it at room temp all night or feed it earlier in the day and pop it in the fridge. It then comes out to warm up a few hours before I bake. It should show strong signs of life. This starter was made with nothing but flour and water--no grapes, no commercial yeast, no juice.

Then comes mixing and kneading. I like to mix the starter with the water first, allowing the starter to break up and dissolve a bit. This ensures good mixing with the final dough. Then I add the flour and salt, mix to a coarse ball...

...and switch to the dough hook for 5 minutes or so. The dough should be stickier than you think it should be. Turn it out onto a floured surface for 4-5 minutes of final kneading by hand to adjust the flour. It should be smooth and supple, still be a bit tacky, and pass the windowpane test. When you stretch it to form a boule, the outside should be smooth and not tear.

Let it rise 3-4 hours at room temp or slightly warmer (a closed oven with a bowl of hot water works well). Then shape and proof for another 3-4 hours.

I start with a very hot oven. 500-550F for artisan loaves. If using a stone, get it in there 45-60 minutes before baking, that way the stone and oven get a good heat soak. Then when the loaves go in, you want to create steam to allow the bread to rise before the crust hardens. A steam pan is a good idea, and I also spray down the walls of the oven with a squirt bottle. Be careful of squirting the light bulb--it will shatter. Don't ask me how I know. After a few squirts, turn the heat down to your final baking temp. I usually go with 450F.

Don't forget to slash them, too. That helps them expand and prevents blowouts. I had some issues getting these guys onto the stone (not my finest hour), but they were still outstanding. You can see the crumb is open and light, but still gelatinized and chewy. Perfect, in my book.