If using frozen fish, thaw in refrigerator until thawed. Rinse the fish well in cool water, cut into half inch cubes and place in a shallow glass fish, sprinkle with salt
In a small mixing bowl whisk together the lime juice, lime zest, passion fruit juice, orange juice, honey and mirin. Pour over the fish, making sure it is well submerged and cover with plastic wrap. Place in refrigerator for one hour, stirring every 15 minutes to make sure all sides of the fish are cured by the liquid
While the fish is marinating, prepare the rest of your ingredients. Slice the chilies in circles, you can leave in seeds if you want the dish to have more heat. Slice the red onion and radishes and soak in ice water with a teeny bit of salt for at least 20 minutes.
When the fish is ready, strain out the juice into the bowl you mixed it in and transfer fish to a large mixing bowl. Strain the red onion and radishes form the ice water and add them to the bowl along with the chilies, cucumber and cilantro . Whisk the coconut milk into the marinade then pour over the fish in the mixing bowl and stir. Season with a little salt and pepper then spoon the fresh passion fruit over the top. You can serve now or chill again until ready to serve. The longer the fish marinades the more the texture will change.
Serve with chips of choice.