
Roasting tomatoes low and slow — well, hot and patient — transforms even ordinary plum tomatoes into something deeply caramelized, jammy, and rich with concentrated flavor. The onion wedges and whole garlic cloves go into the oven alongside them, softening and sweetening as they char at the edges, so every element of the sauce has that irresistible roasted depth before a single drop hits the blender. A pinch of turmeric adds a subtle warmth and a gorgeous golden hue that makes the finished sauce look like it came straight out of a trattoria kitchen. Fresh basil and dried oregano round everything out, keeping the flavor bright even after blending. This is the kind of sauce that makes you want to skip the jar entirely — and since every ingredient here is naturally free of stimulants like caffeine, you can ladle it over pasta at any hour without a second thought. It works beautifully as a pizza base, a dipping sauce, or stirred into a big pot of something cozy on a weeknight.
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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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