METHOD
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preparation
Place a rack in the middle of the oven and preheat it to 210 °C / 410 °F. Prepare a large baking sheet.
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roast the tomatoes
Cut the larger tomatoes in half and add to a baking sheet. Add the cherry tomatoes. Drizzle with olive oil and season with black pepper and salt. Toss to combine and place in the oven. Roast for 30 minutes at 210 °C / 410 °F.
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cook the pasta
While the tomatoes are roasting. Cook the pasta according to the package instructions. Before draining, reserve 250ml (1 cup) of pasta cooking water.
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sauce
Place a large pan over medium heat. Add the olive oil and butter. When the butter melts, add diced onion and thinly sliced garlic. Cook for 6 minutes over low heat, stirring occasionally for the vegetables to soften. Add the roasted tomatoes with all the juices and a handful of basil. Cook for 10 minutes, then transfer to a blender (or use an immersion blender). Add ricotta and, optionally, another leaf of fresh basil. Mix in 100ml (1/2 cup) of reserved pasta water into a smooth sauce. Pour the sauce back into a pan, add the pasta, and toss it to combine. Pour in additional pasta water if needed.
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Serve
Sprinkle Parmesan cheese over the pasta. Divide the pasta between four plates. Season with black pepper and drizzle with olive oil, then serve.