Preheat your oven to 180C/350F.
In a baking tray, add in the tomatoes, peppers, shallots, garlic and drizzle generously with olive oil and season with salt and pepper. Roast the veggies until soft and golden, ~45 mins - 1 hour.
Once roasted, squeeze out the garlic flesh from the bulb and transfer all the roasted veggies into a blender. Add the ricotta, lemon zest, Calabrian chilli paste, basil and blitz until smooth.
Cook your pasta to the instructions on the box. Save ~1 cup of pasta water. Drain the pasta and return into the pot.
Add in the sauce, a bit of pasta water at a time, butter and mix well until smooth and homogenous. Adjust pasta water to desired consistency. Season to taste. Divide onto plates and top with ricotta, grated parmesan and basil.