
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 until everything is golden at the edges and practically begging to be blended. A handful of fresh basil, dried oregano, a pinch of red pepper flakes, and a subtle warmth from turmeric round out the sauce in a way that feels both rustic and a little unexpected. Many jarred tomato sauces rely on preservatives and cured ingredients that sneak nitrates and nitrites into an otherwise simple pantry staple — this one sidesteps all of that with nothing but whole vegetables, olive oil, and spices. Every ingredient on this list is exactly what it looks like, which makes it a genuinely trustworthy option for anyone keeping a close eye on what goes into their food. The blender step pulls all those roasted pan juices into the mix, so none of that hard-earned caramelized flavor gets left behind on the baking sheet. Toss it with pasta, spoon it over polenta, or use it as a pizza base — this sauce earns a permanent spot in your rotation.
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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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