Sourdough breads are made by using a sourdough starter. The starter cultivates yeast and lactobacilli in a combination of flour and h2o, using the microorganisms currently present on flour; it does not want any extra yeast. Naan is known for its delicate, a bit chewy texture and mouth watering flavor. https://fooded26047.blogpayz.com/32078095/food-no-further-a-mystery