Cut the potatoes into a small cubes.
If you're cutting the potatoes ahead of time, soak in cold water.
Drain the potatoes and pat dry.
Heat a frying pan over medium high heat.
Add 1 tablespoon vegetable oil to the pan.
Add the cubed potatoes into the frying pan and let them fry on one side for a few minutes (don't be tempted to move the potatoes).
Once the potatoes have developed a crust, gently toss so that the rest of the edges fry up.
In a small bowl, combine the soy sauce, maple syrup, rice wine (if using) and water. Give it a stir.
Pour the sauce into the pan and coat the potatoes.
Lower the heat to a simmer and cover with a lid.
Let the potatoes braise for 5-7 minutes, until soft and tender. Keep an eye on how quickly the sauce is thickening.
If it's too thick, add a splash of water.
Remove from heat.
Drizzle sesame oil, and garnish with green onion and sesame seeds.