Bring 4-5 l salt water (1 teaspoon salt per litre) to the boil. Drain the tuna and collect the oil. Clean the chilli, cut lengthwise, remove seeds and wash. Peel garlic. Chop chilli and garlic finely.
Heat the tuna oil in a tall frying pan. Sauté the chilli and garlic in it.
Add the noodles to the boiling water and cook according to the instructions on the packet. Add tomatoes, tuna and capers to the pan, bring to the boil and simmer open for about 5 minutes.
Wash and shake parsley dry, chop roughly and stir into the sauce. Season with salt, pepper and 1 pinch of sugar. Drain the pasta and serve with the sauce.