For dough, sprinkle yeast and sugar into warm water in small bowl; let stand until foamy, about 5 minutes.
Mix flour, cornmeal, oil and salt in a large bowl; make a well in the center and add yeast mixture.
Stir to form a soft dough, adding more flour if
necessary. Turn onto a floured board and knead until dough is supple
and elastic, 7 to 10 minutes. Transfer to a large bowl, cover and let rise
in a warm spot until dough has doubled, about 1 hour. Punch down.
Roll dough to a 13−inch circle. Transfer to an oiled 12−inch pizza pan,
folding the excess over to make a small rim. Spread with pizza sauce;
sprinkle with all but a handful of the mozzarella cheese. Sprinkle with
meats and vegetables. Top with remaining mozzarella and Parmesan
cheese. Let rise in a warm spot about 25 minutes.
Heat oven to 475 degrees. Bake pizza until crust is golden, about 25
minutes. Let stand 5 minutes before slicing.