Cook the pasta according to the packet instructions, drain and keep warm.
Deseed and finely chop the chilli. Chop the garlic. Roughly chop the tomato.
Heat the oil in a frying pan, then add the garlic, oregano and chilli. Sir for a minute then add the capers and tomato. Put a lid on and gently sauté for ⅔ minutes until the tomato pieces have softened. Now add the tomato purée, passata and black olives, then cook for 5 minutes.
Drain the tuna and stir it in to warm through. Season with salt and pepper, then add the spinach. Put the lid on and cook over low heat for a couple of minutes, until the spinach has wilted.
Stir through the pasta and serve warm.
Serve with some grated parmesan or some chopped fresh herbs scattered on top.