Mix all ingredients except salt and yeast. Combine the starter, flour, water, and sugar in a large bowl. Stir well, using your hands if needed to incorporate all ingredients. The mixture may look dry but will feel slightly sticky to the touch. Cover and allow to rest at room temperature for thirty minutes.
Knead in the salt and yeast. Add the salt and yeast on top of the dough, and knead until smooth, stretchy, and elastic. (If using a bread machine, set it on the dough cycle. For a stand mixer, set it on low about 5 minutes. If kneading by hand, knead for about 10 minutes.) Check the consistency of the dough after a few minutes of kneading. It may seem sticky, but should clear the sides of the bowl and should not be too difficult to work with. If it seems very wet, add more flour a few tablespoons at a time.
The first rise. When the dough is kneaded, cover it and put in in a warm place to rise between 60-90 minutes, until nearly doubled in size.
Shape the rolls. Turn the dough out onto a clean counter or a cutting board. Prepare a baking sheet with parchment paper or oil and flour. Dust the top of the parchment with cornmeal. Divide the dough into 8 equal pieces, either by dividing into half, then quarters, then eighths, or by. using a kitchen scale. Shape the pieces into rolls by pinching the bottoms. Place on the cornmeal dusted parchment. Rub the tops with flour. Slash, if desired, using a lame or sharp knife.
The second rise. Cover the rolls with heavily greased plastic wrap and let rise in a warm place for 45-60 minuts, until puffy. Towards the end of the rising time, preheat your oven to 450 degrees. Place one rack in the center, and one in the lower middle area. Place an empty baking sheet on the lower rack to get hot while the oven preheats.
Bake with steam. When the oven has heated and the rolls have risen, pour one cup of water on the hot baking sheet to create steam. (It may buckle, this is ok.). Place the rolls inside and bake for 17-21 minutes, until browned outside. Cool rolls on wire rack for at least 30 minutes before serving.