Most of my recipes call for somewhere in the ballpark of 20% starter....so it generally doesn't wind up being a cup for me either. I just read that 1 c. = 1 package of yeast, so I guess one could roughly determine the ratio. A little more/less starter isn't going to make a huge difference as long as you have the hydration correct.
While I've never done this before, I've read that 1 package of yeast has the rising power of 1 c. liquid starter so you can make that substitute and then remove ½ c. each water an flour from the recipe to compensate for the ingredients in the starter.
Thanks for your reply! Sourdough recipes usually call for two tablespoons of starter. You'e suggesting a cup of starter (which I think is 16 tablespoons) and then removing a half a cup of water and a half a cup of flour from the overall recipe - have I got that right?
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