
Roasting tomatoes low and slow — well, hot and patient — transforms even an ordinary plum tomato into something deeply caramelized, jammy, and rich with concentrated flavor. The onion wedges and whole garlic cloves go into the oven right alongside them, softening and sweetening as they char at the edges, so every element of the sauce has earned its place before a blender ever gets involved. A pinch of turmeric adds a subtle warmth and a gorgeous golden undertone that makes the finished sauce look almost too pretty to cover with pasta. Fresh basil and dried oregano round things out with that classic Italian-American backbone, while a hit of red pepper flakes keeps it from being one-dimensional. Store-bought jarred sauces are a minefield of hidden additives and oils that can be hard to track down on a label, so making your own from scratch means you know exactly what's going in the pot. This one comes together with nothing but whole vegetables, olive oil, and a handful of pantry spices — clean, straightforward, and completely satisfying. Spoon it over pasta, use it as a pizza base, or just dip a torn piece of crusty bread into the pan while it simmers.
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Preheat the oven to 425°F (220°C). Arrange the tomato halves cut-side up on a large rimmed baking sheet. Scatter the onion wedges and unpeeled garlic cloves around the tomatoes. Drizzle with 3 tbsp of the olive oil and sprinkle with the salt, black pepper, and red pepper flakes.
Roast on the center rack for 40–45 minutes, until the tomatoes are deeply caramelized at the edges, collapsed, and beginning to char in spots, and the onion wedges are softened and golden at the tips.
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