Bring a large pot of water to the boil and add a generous spoon of salt.
Meanwhile, heat a generous splash of olive oil in a large pan over moderate heat.
Add the sliced chorizo and diced onion. Cook for a few minutes until the onion is soft and the chorizo is fragrant and beginning to crisp.
Add the chopped tomatoes, sliced roasted capsicum, and sweet paprika. Stir to combine.
Sprinkle in 1 teaspoon of sugar, cover with a lid, and reduce the heat slightly. Simmer for 4–5 minutes.
Stir the sauce, then add a small ladle of pasta water. Cover again and cook for another 5 minutes or until the tomatoes have broken down.
(Optional) Add a handful of sliced olives. Taste the sauce and adjust seasoning with salt & pepper and a little more sugar if needed.
Cook pasta according to packet instructions. Once cooked, transfer pasta directly to the pan with the sauce, bringing some pasta water with it.
Toss to combine, adding a little more pasta water if needed to loosen the sauce.
Serve with a drizzle of olive oil, a sprinkle of cheese, and parsley if desired.