Boil up plenty of salted water. Peel and chop the onion and garlic. Lime hot
wash, dry and cut in half. Squeeze one half, cut the other into small pieces
Cook the spaghetti in boiling salted water for 8-10 minutes until al dente. Heat the oil. Sauté onion and garlic. Add cream and bring to the boil
Bind the sauce with sauce thickener. Drain the tuna. Stir the capers into the sauce and season with salt, pepper, chilli powder and lime juice
Drain the spaghetti. Mix immediately with the sauce and serve with lime pieces and basil