Cook the penne in a large saucepan until al dente. First add the pasta to the bubbly cooking water. No oil, but salt the water.
Finely chop the spring onion, garlic and capers. Cut the zucchini into small cubes. Heat the olive oil in a pan with a high rim, sauté the onion and garlic. Drain the tuna and pluck it into pieces. Add the tuna with the zucchini cubes to the onions and sauté for a few minutes. Top up with the cream. Then season with sea salt, cayenne pepper and some ground caraway seeds.
Drain the penne and immediately place on a plate with a little pasta water and mix immediately with the sauce.