Prepare Dough:
In a small bowl, combine warm water, sugar, and yeast. Let sit for 5–10 minutes until foamy. In a large bowl, mix flour, cornmeal, and salt. Add melted butter and yeast mixture. Knead for 5–7 minutes until smooth. Cover and let rise for 1–1.5 hours, until doubled.
Preheat Oven:
Preheat oven to 425°F (220°C).
Prepare Sauce:
Heat olive oil in a saucepan over medium heat. Add garlic and sauté 30 seconds. Stir in crushed tomatoes, oregano, salt, pepper, and sugar. Simmer for 15–20 minutes, stirring occasionally.
Assemble Pizza:
Grease a 9-inch deep-dish pan. Press dough into the pan, pushing up the sides to form a thick crust. Layer mozzarella cheese on the bottom, followed by cooked sausage and Parmesan cheese. Pour tomato sauce over the top.
Bake:
Bake in preheated oven for 25–30 minutes, until crust is golden and sauce is bubbly.
Cool and Serve:
Allow pizza to cool for 5–10 minutes before slicing. Serve hot.