Steam the potato, and ginger in a pot, adding a little water until potato is soft.
Heat your pan, then add olive oil and place snapper skin side down and hold for 1 min, then turn heat down to medium. Cook for about 3 min or until skin is crisp then turn over and cook for a further 3 min (cooking time will depend on the thickness of your fillet).
Mash the potato and stir through white pepper, sesame oil, milk and seasoning.
Place snapper on a plate with mash, garnish with a lime wedge and serve.