To make spaghetti with green beans, tomato and tuna, peel the tomatoes and cut them into small pieces, collecting them in a bowl with the juice they will release. Then mix them with the crumbled tuna. Heat 4 tablespoons of oil with a whole garlic clove, a sprig of chopped parsley and a chilli pepper to taste; then remove the garlic and pour the oil on the mixture of tuna and tomatoes. Boil the beans very al dente, drain them with a slotted spoon keeping their water on the fire, and divide them in two lengthwise: they will acquire the ideal thickness to pair with spaghetti. Put them back in their boiling water together with the spaghetti and salt. Finally, drain the pasta with the green beans and season with the mixture of tuna and tomatoes.