He doesn’t advocate using this method all the time as he isn’t sure of what actually happens within the levain when it ferments faster: does it develop undesirable acids or aromas? He hasn’t been able to tell just from tasting the resulting bread. Still he finds it a handy tool to have as it makes for more flexibility.
As for me, when we did the experience described below, since we didn’t bake with any of these three pieces of levain, I can’t vouch for the taste but I can tell you one thing: the levain fermented on third speed had aromas which were heady enough to make a grown woman swoon. Plus it ended up so round and fluffy I wished I could have used it that night as a pillow. Forget about cloud nine! I’ll take cloud three anytime…


Pictures taken before the start of the experiment
#3 may look a bit bigger than #2 to start with but it is an optical effect.
All three levains weigh exactly the same.
- Shortly before 8:00 AM, Gérard feeds his regular levain and scales off three 1,650 g pieces which he calls #1, #2 and #3 respectively. Please note that he keeps his levain at 57% hydration and always salts it
- He rounds the three pieces gently
- At 8:20 AM, he places #1 in a plastic box, loosely covered, and puts the box on its side (to make later comparisons easier) (this is first speed)
- He places #2 next to #1 and loosely covers it with a sheet of clear plastic (this is second speed)
- He places #3 next to #2 on a clear sheet of plastic which he loosely wraps around it (this is third speed).
- When wrapping the levain for third speed, it is important to leave it room to expand as its volume will triple
- The three levains are then left to ferment side-by-side at room temperature (about 78°F) for about six hours
- At 2:20 PM, Gérard uncovers the three levains simultaneously
- Significant differences in sizes can be observed between them, ranging from #1 (the smallest) to #3 (the largest)



- #3 has obviously reached a more advanced stage of fermentation (Gérard’s theory is that wild yeast cell counts shoot up when the levain is completely sheltered from ambient air)
- #3’s fluffiness makes it much easier to incorporate into an autolysed dough: there is no risk that some pieces of it might remain firm and unincorporated
- For the sake of the side-by-side photo comparisons, Gérard has made all three levains into boules today but when he actually uses the third speed in a production setting, he shapes the levain into a long sausage before wrapping it. The fermentation is even faster that way.
Other Gérard Rubaud stories may be found on this page.