For cooking pasta: Bring the water to boil with the salt. Drop the pasta only when the water boils a lot, stirring constantly and cook until al dente. See cooking time indicated on packaging. To garnish tuna flavored with orange: Cut the tuna into regular cubes,add them to the pasta off the heat, but when it’s still hot into a pan.Stir constantly adding a drizzle of oil,the condiment left apart, scraping of orange and fresh fennel. Garnish it adding diced tomatoes. Serve cold with a leaves of fresh rocket. For rocket condiment: Clean and wash the rocket. Blanch the rocket in boiling water for half a minute to make it less spicy. Chill the leaves in chill water and ice,whirl with an immersion minipimer,adding oil and water used for cooking. Salt to taste. Bear condiment apart.