Cut the onion into small pieces and cut the carrot and zucchini into thin strips
Heat up a pan with olive oil and add the onion and carrot. Let this simmer on medium heat for about 10 min or until the carrot has softened a bit. Add the zucchini afterwards
Make a mixture of soy sauce, sesame oil, chilli flakes and honey. Add this to the veggies and crank up the heat. Turn of the heat when everything is cooked
Pat the tuna dry, season it with salt and pepper and coat it with sesame seeds
Cook the tuna in a pan with olive oil on medium high heat. Cook on all sides for about 2 min
Take the tuna off the heat and cut it. Place it on top of the veggies and top it of with some spring onion and some leftover soy sauce mixture