We're glad you asked, Marlene. We actually have a full article on our blog about this very subject called, "Adding sourdough to a recipe." In short, you can replace 4 ounces (a scant 1 cup) of the flour and 4 ounces (1/2 cup) of the water in the recipe with 1 cup of fed/unfed sourdough starter. If you used unfed starter, the flavor might be more sour. If you use fed starter, the rolls might rise faster but the sourdough taste may be most subtle. You'll still want to use the full amount of yeast if you use unfed starter; you can experiment with reducing the yeast if you use fed starter. Happy baking! Kye@KAF

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