Clean, wash and chop the spring onions. Wash the thyme and remove the leaves
Brown the spring onions in hot oil. Add tomatoes and juice, bring to the boil. Chop the tomatoes coarsely. Season with thyme, salt, pepper and sugar. Let the sauce boil down for about 10 minutes
Meanwhile cook the pasta in plenty of boiling salted water for 8-10 minutes until al dente
Drain the tuna and pluck smaller with a fork. Add the olives to the sauce and heat. Season the olive and tuna sauce with salt and pepper. Drain the spaghetti and serve immediately with the sauce