Preheat the oven to 400 F/205 C.
Combine the tomatoes, garlic, shallot, salt, pepper, sugar, and Italian seasoning in a 9 inch cast iron skillet, dutch oven, or oven-proof baking pan.
Bake the sauce for 30 minutes, or until the pizza sauce looks reduced and thickened.
Transfer the sauce to a blender and blend until smooth, about 30 seconds.
Store it in a sealed container or jar in the fridge for 5 days or in the freezer for up to 3 months!