1. To a large mixing bowl, add the warm water, dry active yeast, and active sourdough starter. Use a whisk or Danish dough whisk to combine, and dissolve the starter. Let sit at room temperature for 5 minute to activate the yeast.

2. Add the whole wheat flour, unbleached all purpose flour, and kosher salt to the bowl. Use a Danish dough whisk or a wooden spoon to mix the dough. It will be a bit sticky and shaggy. That's totally normal.

3. Then use your clean hands to finish mixing the dough. Use a pinching motion to incorporate all of the flour and salt, making sure that there are no dry spots.

4. Cover the dough with plastic wrap, or a clean shower cap. Let it rest at room temperature for 15 minutes.

5. Instead of kneading this dough, we're going to do a series of stretches and folds. This is a gentle way to build up the gluten strength without tearing the dough. Keep the dough in the bowl, and start by stretching/pulling up one side of the dough gently until it won't give any more. Then fold the stretched dough over the rest of the dough. Rotate the bowl 90°, and stretch up another side of the dough, then fold it over. Work your way all around the bowl. Then reach under the ball of dough, and plop the whole thing over. Cover with plastic wrap, and let it rest for another 15 minutes at room temperature.

6. Repeat the stretch and fold process one more time. Then cover the bowl again, and let it rise at room temperature for about 2-3 hours until it has nearly doubled in size, and is puffy. This depends a lot on the temperature of your kitchen. A warm kitchen will make the dough rise faster. A cold kitchen will delay the rise.

7. Lightly flour your work surface. Pour the dough out onto the work surface. Divide the dough into 10 equal pieces. Use a kitchen scale to make sure they're equal. Each dough ball should weigh about 80-82g.

8. Preheat the oven to 425°F. Place a heavy skillet or baking pan in the oven to preheat as well, to create steam while the rolls bake.

9. Line a baking sheet with parchment paper. Set aside. Boil a kettle of water. Set aside.

Shaping the Dinner Rolls

1. Work with one piece of dough at a time. Lightly flour your hands. Bring all of the edges of the dough into the center, pinch to seal. Place the dough, seam side down onto the work surface. Make your hands into a claw/cage shape, and gently roll the dough under your hand on the work surface, to create tension, and a more round shaped roll.

2. Place the shaped rolls on the parchment lined baking sheet, about 1.5 inches between each rolls. Lightly sprinkle the tops of the rolls with flour. Lay a clean kitchen towel over the top of the rolls, and proof (rise) at room temperature for another 45 minutes.

3. Carefully pour the kettle of water into the heated cast iron pan in the oven. Be very careful because the hot steam can burn.

4. Slash the top of the rolls with a lame or very sharp chef's knife. The slash should be about 1.5-inches long. Try to hold the blade at a 45° angle, and cut about 1/2-inch deep.

5. Place the rolls into the steaming hot oven immediately after slashing. Bake for 15 minutes. Carefully open the oven door because of the hot steam, and rotate the baking sheet 180°, bake for another 10-15 minutes until the rolls are very golden brown. Let cool for at least 30 minutes. Serve warm, or crisp up before serving *see notes in post.