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Bring a large pan of salted water to the boil. Add the spaghetti, lower the heat to medium and cook for 10 mins until al dente.
Meanwhile, heat the oil in a large, lidded frying pan over a medium heat. Cook the onion until softened, about 5-6 mins. Then, flake in the tuna and adding the olives, lemon zest, juice and spinach. Stir together and cover, then leave to cook for 3 mins. Turn off the heat, leaving it covered for 5 mins, until the spinach has wilted.
Drain the pasta, reserving 150ml of the cooking water. Add the pasta to the tuna mixture and toss together, adding a good splash of the reserved water. Add most of the herbs, toss together and season with black pepper. Divide between bowls, and top with the remaining herbs.
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