Drain the tuna, pluck it roughly. Wash spinach, sort and drain well. Peel onion and garlic and dice finely. Cook pasta in boiling salted water according to package instructions
Heat the oil in a pot. Sauté onion and garlic in it. Add the tomato paste and sauté briefly. Add the tomatoes and chop them in the pot with a spatula. Let simmer for about 5 minutes. Drain the noodles and let them drain
Add spinach to the sauce and stir in. Remove from heat. Add the tuna, season with soy sauce, pepper and sugar. Mix in the pasta and serve immediately