1/2 teaspoon crushed red pepper flakes, or more to taste
fine sea salt to taste
2 tablespoons tomato paste
1/4 cup Marsala wine
28 ounces whole San Marzano tomatoes, hand crushed
26.46 ounces strained tomatoes
3–4 basil stems
1 Parmigiano-Reggiano rind
2 bay leaves
Fresh basil for serving, torn
Instructions
Add your onions, carrots, celery, and garlic to a food processor. Pulse until it is finely chopped and forms a paste.
Heat a Dutch oven over medium heat with olive oil. Add the vegetable paste. Stirring constantly, allow it to cook for 10 minutes until the liquid has released and the mixture is aromatic and tender.
Add the mushrooms and continue to stir, allowing them to release their liquid and turn slightly golden brown, 8-10 minutes.
Season with salt, oregano, and crushed red pepper flakes.
Add the tomato paste and cook for 2 minutes until it deepens into a rusty color.
Add the Marsala wine, making sure to scrape any brown bits from the bottom of the pan. Let it simmer until it has mostly evaporated.
Add the San Marzano tomatoes, strained tomatoes, parmesan rind, basil stems, and bay leaves. Stir to combine.
Let the mixture come to a simmer, and then turn the heat to low, partially covering the Dutch oven.
Allow it to cook for 45 minutes to an hour until it has thickened and reduced, stirring occasionally.
Remove from the heat. Remove the parm rind, bay leaves, and basil stems. Stir in fresh basil.