
Roasting plum tomatoes at high heat until their edges caramelize and char in spots is the kind of kitchen move that transforms a simple sauce into something deeply complex and craveable. The tomatoes collapse and concentrate in the oven alongside sweet onion wedges and whole garlic cloves, building a rich, layered base before a single drop of liquid ever hits the pan. Extra virgin olive oil does double duty here — it helps everything roast beautifully and brings its own well-documented benefits to the table. A pinch of turmeric and fresh basil folded in at the blending stage add brightness and a subtle earthiness that make this sauce taste like it simmered for hours. Red pepper flakes and dried oregano round out the flavor without any of the processed additives or excess sugar you'd find lurking in a jarred version. The whole thing comes together in under an hour and serves four, making it an easy weeknight staple or a batch-cook win you can stash in the fridge for pasta, grain bowls, or dipping. It's the kind of sauce that quietly does a lot of good while tasting like pure comfort.
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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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