Peel and finely chop the garlic. Onions peel, halve and in fine half rings cut. Pour tuna into a sieve and drain well. Wash basil, shake dry and pluck leaves from the stalks except for 1 stem
Mix tomatoes, tomato paste, 750 ml water, garlic, chilli flakes, salt and pepper. Tuna fish to pieces. Add capers, onions, tuna and basil
Put the spaghetti in a deep frying pan, pour tomato sauce evenly over it. Cover and bring to the boil over medium heat, simmer for about 13 minutes, stir the egg 3-4 times. Remove from the stove. Garnish with remaining basil