Fry onions, celery and carrots till soft
Add chorizo, paprika, oregano and chili. Fry till chorizo begins to release oil
Add tomato puree and garlic, cook for 1 minute
Mix in tuna, chopped tomatoes and sugar. Simmer on low heat for 30 mins
Meanwhile cook pasta according to packet instructions
Mix together crème fraîche with Parmasan, salt and pepper
stir tuna sauce through the pasta, place in a large casserole dish and top with cheese sauce
Bake in a preheated oven 180C for 30 mins (40 mins from chilled)
Serve with salad and extra chili flakes