Bring about 1cm (1/2 in) salted water to the boil in a medium saucepan. Meanwhile, chop your broccoli into bite sized little trees and slice the stems. When the water is boiling add the broccoli to the pot and cover. Simmer for 4 minutes or until the broccoli is no longer crunchy, drain.
Return the pot to a medium heat. Add tuna and the oil from the can. Or if your tuna comes in water or brine drain it first and add a few tablespoons of extra virgin olive oil to the pan. Add the capers and cook for a minute, stirring to break up the tuna. When the tuna is hot add the cream and bring to a simmer.
Add the drained broccoli and stir to coat in the sauce. Remove from the heat and stir through parsley or chives (if using). Serve with lemon squeezed over as you like.