In a food processor, combine flour, salt, and cubed cold butter. Pulse for 15 seconds until the butter has been cut into the flour.
In a separate bowl, dissolve instant yeast in 90F water. With the food processor running, stream the yeast mixture into the flour mixture until well combined.
Move the dough to a bowl and round it into a ball shape with a little bit of tension. Ferment at room temperature for 30 minutes before refrigerating for at least 12 hours, preferably 24.
Preheat the oven to 425F. In a medium saucepan, melt butter and add grated white onion and minced garlic. Fry for 4-5 minutes.
In a separate bowl, combine crushed tomatoes, whole peeled tomatoes, tomato paste, salt, sugar, oregano, basil, and chili flakes. Add the tomato mixture to the saucepan and reduce by 40-50% for 15-20 minutes.
In a separate bowl, combine ground pork, salt, sugar, paprika, dried sage, black pepper, chili flake, garlic, crushed toasted fennel seed, and red wine vinegar. Mix until combined.
Roll out the dough and press it into a greased 12-inch deep dish pan. Layer full-fat mozzarella cheese, provolone cheese, Italian sausage, pizza sauce, thin-sliced pepperonis, and grated Parmesan cheese.
Bake for 35-40 minutes. Cool for at least 10 minutes before slicing and serving.
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