Add the potatoes to heavily salted boiling water. Set a timer for 15 minutes and cook the potatoes until they are fork tender.
Meanwhile, to a large mixing bowl, add the tuna, spring onion, egg, chilli flakes, dried coriander, jalapenos and a pinch of pepper.
Add the drained potatoes to a bowl and mash with a potato masher. Season with salt and pepper, then transfer into the bowl with the tuna. Stir to combine, then stir the flour into the mix.
Add a layer of panko breadcrumbs onto a baking tray. Make up 8 tuna fishcakes from the mixture, coating each with the panko breadcrumbs by placing onto the tray, flipping and patting the breadcrumbs to bind with the fishcakes.
Fry in a pan with 1 tbsp of olive oil. Cook for 4-5 minutes on each side, rotating once golden and crispy.
Serve with a Sriracha/mayo mix and enjoy!
Note: for a fancy garnish, slice the greener end of the spring onion into thin strips and place in an ice bath, this will cause them to curl.