1. Boil a large pot of salted water. Cook rigatoni per packet instructions. Reserve 100ml pasta water before draining.
2. Fry the chorizo in a large pan over medium heat 2–3 mins until oil is released. Add minced garlic and chilli flakes, cook 30 secs.
3. Add tinned tomatoes and a pinch of sugar. Simmer 8–10 mins. Season.
4. Add spinach and stir until wilted. Add drained pasta and toss with pasta water to loosen.
5. Remove from heat. Tear in the mozzarella and fold through — it should be melting but still have some chunks.
6. Serve scattered with fresh parsley and a drizzle of olive oil.