28ounceswhole peeled tomatoescanned, with their juice
1tablespoonextra-virgin olive oil
1tablespoonunsalted butter
2medium cloves garlicgrated on microplane grater (about 2 teaspoons)
1teaspoondried oregano
Pinchred pepper flakes
Kosher salt
1medium yellow onionpeeled and split in half
26-inch sprigs fresh basil with leaves attached
1teaspoonsugar
Instructions
Process tomatoes and their juice through food mill. Purée should not be completely smooth, but should have no chunks larger than 1/16th of an inch. Set tomatoes aside.
Combine oil and butter in medium saucepan and heat over medium-low heat until butter is melted. Add garlic, oregano, pepper flakes, and large pinch salt and cook, stirring frequently, until fragrant but not browned, about 3 minutes.
Add tomatoes, onion halves, basil sprigs, and sugar. Bring to a simmer, reduce heat to lowest setting (bubbles should barely be breaking the surface), and cook, stirring occasionally, until reduced by half, about 1 hour.
Discard onions and basil stems. Season to taste with salt. Allow to cool and store in covered container in the refrigerator for up to 2 weeks.