Homemade Chicago-Style Deep Dish Pizza

In a large bowl, combine the flour, cornmeal, salt, sugar, and yeast.
Add the water and melted butter, and mix until the dough starts to come together.
Knead for about 5 minutes on a lightly floured surface, or until smooth. The dough should be slightly sticky but not overly wet.
Grease a bowl with 1 teaspoon olive oil, place the dough inside, and cover with a damp towel. Let it rise for about 1 hour, or until doubled in size.
After rising, punch down the dough and divide it into two portions: one for the bottom and one for the top crust.
2. Prepare the Sauce:
In a saucepan, melt the butter over medium heat. Add the grated onion, oregano, and salt. Cook for 3–4 minutes until the onion is softened.
Stir in the minced garlic and cook for another 1–2 minutes until fragrant.
Add the crushed tomatoes, sugar, and basil. Stir well, and let the sauce simmer for about 20 minutes, stirring occasionally. Season with freshly ground black pepper to taste.
Set the sauce aside to cool slightly.
3. Assemble the Pizza:
Preheat your oven to 425°F (220°C)