Combine sugar, hot water, and yeast in your mixer. Let proof for 15 minutes.
Add milk, olive oil, and 3 cups of bread flour. Mix until well combined and let rest for 30 minutes.
Add 1/2 - 3/4 cups flour and salt. Knead on medium for 5 minutes. Turn out into a well oiled bowl, turn to coat, and cover to let the dough rise until doubled, approximately 1.5 hours.
Punch down the dough and let rise again for 30 minutes. Preheat oven to 450.
Place approximately half of the dough into your well-oiled cast iron skillet. Poke with a fork to create some holes. Place on your stovetop over high heat until the skillet is hot and the oil under the pizza crust is bubbling. Place pizza and pan into the oven on the bottom rack for 10 minutes to pre-bake.
Top with your favorite toppings, and finish baking for approximately 30 minutes.