In a mixer with a dough hook, add yeast to the water and mix
Add the sugar and salt to the mixer
Add the cornmeal and keep mixing
Dump in all the flour and keep mixing until it turns into a ball
Divide the ball into two equal parts
Generously coat the inside of a 12" cast iron skillet with olive oil and press one of the dough balls into a flat shape that takes up the bottom of the pan
Flip the pan over onto a pizza screen and then add your toppings
Cook on the bottom rack in a preheated oven set to 500 degrees or so for about 7 minutes