The night before you want to bake: Add ⅓ cup sourdough starter discard, 2 teaspoons fine sea salt, 2 tablespoons olive oil, ⅓ cup + 1 tablespoon whole wheat flour, 3 ¾ cups all-purpose flour, and 1 ⅓ cups + 1 teaspoon water to a large mixing bowl and mix by hand until fully combined. Cover and let the dough ferment at room temperature overnight.
The next morning: Perform a set of stretch and folds to strengthen the dough. Wet your hand with water to prevent sticking. While keeping the dough in the bowl, gently pull one side up and fold it over itself. Rotate the bowl and repeat on all sides until you've completed a full circle. Cover the bowl and refrigerate for 8 to 36 hours. The dough can be used immediately to make your pizza, but the cold ferment is optional and will help develop more flavor.
When ready to cook: Remove the dough from the fridge and let it rest on the counter for 30 minutes at room temperature. Divide the dough into 4 equal pieces. Shape each portion into a ball on a generously floured work surface. Cover the dough with a tea towel and let them rest for 30 minutes.
Turn on your oven's broiler to HIGH. On a stovetop heat a cast iron skillet over medium to medium-high heat. If needed, lightly oil the cast iron skillet to prevent sticking.
While the skillet is preheating, press a dough ball into an 8" circle on a floured surface using your hands. Use more flour as needed to prevent sticking. (If the dough is difficult to shape, let it rest for 15 minutes on the counter to allow the gluten to relax.)
When the skillet is hot, lay the circle of dough in it. VERY carefully use your fingers to press the edges of the dough to cover the bottom of the skillet. Immediately add the sauce and toppings to the crust and cook for 5-6 minutes or until the bottom of the crust starts to char. TIP: If the dough is too thick, you will need to cook it longer on the stovetop at a lower temperature to ensure the crust cooks through properly. You can also try putting it under the broiler for a few minutes before adding the toppings to help it cook through and avoid the "gum line" in the center. Once the bottom has turned brown and charred, transfer the cast iron skillet to the broiler to finish baking the top of the pizza for 2-4 minutes. Remove from the oven, slice, and serve hot. Make sure to keep an eye on it to prevent the toppings from burning, as broiler temperatures can vary. Every oven is different, so individual results may vary.