Put the pasta in plenty of salted water without oil. Put the tomatoes, creme fraiche and olive oil in a saucepan and heat. In the meantime, cut the garlic into sticks and the piri-piri into small rings. Add the tuna, garlic and piri piri and simmer slowly. Season to taste with salt and herbs.
Garnish with grated cheese if you like.
The sauce tastes almost even better on the second day!