For the spinach spaghetti, sauté chopped onion in 2 tablespoons of olive oil, add tuna and continue sautéing. Season to taste with the spices and mix with the now defrosted creamed spinach.
Add the whipped cream and bring to the boil once briefly. Add the feta, stir once briefly and remove from the heat.
Mix in the cooked spaghetti and serve.