What makes sourdough special?
Sourdough is made using sourdough starter, which is a fermented flour and water mixture that contains natural yeast. This gives the bread a distinct "sour" flavor which is different than breads made with commercial yeast.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: What makes sourdough special?
### Input: 
### Response: Sourdough is made using sourdough starter, which is a fermented flour and water mixture that contains natural yeast. This gives the bread a distinct "sour" flavor which is different than breads made with commercial yeast.