Mix the ingredients of the stir fry sauce together and set aside.
Peel the plantain and cut into slices.
Heat the oil in a frying pan and fry the plantain slices for about 2-3 mins on each side until golden brown and cooked through. You might need to do this in two batches.
Whilst the plantain slices are cooking steam the broccoli for about 7 mins or until you get the softness you desire and set aside.
Heat a tsp of oil in the wok and add the spring onions and stir fry for a min.
Then add in as much of the stir-fry sauce as you like, cook for a min before adding in the fried plantain, broccoli and smoked mackerel and stir fry for another min.
Serve warm with some rice and toasted sesame seeds.
Notes
For vegans ignore fish and add more plantain.[br]Feel free to make up more stir-fry sauce to your preference.