
There is something deeply satisfying about a tomato sauce built entirely in the oven, where time and high heat do most of the heavy lifting. Plum tomatoes roast at 425°F until their edges caramelize and char, concentrating every bit of natural sweetness into something far richer than anything that comes from a jar. Onion wedges soften and turn golden alongside unpeeled garlic cloves that squeeze out buttery and mellow once roasted, giving the sauce a rounded depth without any sharpness. A pinch of turmeric adds a subtle warmth and a gorgeous golden hue that makes the finished sauce look as good as it tastes. Fresh basil, dried oregano, and a hit of red pepper flakes round everything out before it all gets blended smooth with the pan juices and a final drizzle of olive oil. Because every ingredient here is a straightforward pantry or produce staple, there is zero guesswork about hidden additives or cross-contact concerns — just clean, honest flavors you built yourself. Toss it with pasta, spoon it over roasted vegetables, or use it as a pizza base and it will absolutely deliver every single time.
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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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