My grandma told my mum a weird process of making flatbread dough recently that she started to use. But I am not sure about it's safety at all.

  • Initially, normal wholewheat bread dough made with Instant Yeast. Used to make bread but a small piece is kept (~70-100gm) in refrigerator.
  • Next day, when making new dough, that 70-100gm portion of old dough is mixed in and it's allowed to rise for 2-3 hours.
  • A 70-100gm portion of this mixture is kept again in refrigerator and mixed in next day.
  • Repeat same everyday.

The result is definitely great for the flatbread naan but I am not sure about safety of this.

Question: Wouldn't a small part of it be too old after 2 weeks or so? I am sure some of of the old dough remains, however diluted. Mom claims she'd start process totally fresh after a month but I believe that's too long.

Edit: I heard it's similar to Pâte Fermentée but I'm still not sure if about a whole cycle.

  • 2
    Are you familiar with sourdough starters? Seems like basically the same idea
    – Kat
    Oct 5, 2020 at 3:51
  • @Kat I am familiar but never really worked with them. But yeah, I can see the similarity. I researched further and it does sounds even closer to preferments, specifically Pâte Fermentée.
    – Sam
    Oct 6, 2020 at 16:04

1 Answer 1


This is how bread was made in my area just two generations before, not only flatbreads but every kind of dough. And the process wouldn't be started from scratch with new instant yeast, because it didn't exist yet.

I understand why you would say that a diluted piece of the old dough would remain after a month, but mind that fermentation is a metabolic process that converts molecules, and although actual atoms could be there, they were processed and rebuilt each time the dough ferments.

Compare that with any plant you eat; a part of this plant was a previous plant that was used as a fertilizer, maybe even passed through the animal metabolism. It's a cycle.

  • Thanks. That does make a lot of sense. Would you mind sharing the process you mentioned - or just the differences.
    – Sam
    Oct 6, 2020 at 16:05
  • It's the same process as you described, just without restarting it with instant yeast. When making dough, add the old piece of dough in it and let it rise. Before shaping the bread, store a piece of dough for the next day. I guess the question is, where did the first piece of dough come from? I don't know, as the instant yeast is now prevalent, but I guess it was some kind of a sourdough starter. Btw. I never tried this, it's what my mom told me about her mom's process. Oct 7, 2020 at 7:34

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