MAKING THE GELEE. Combine the water, orange juice, sugar, and rehydrated kanten in a pot. Set the pot over high heat and bring it to a boil. Reduce the heat to a simmer and skim any impurities that rise to the top. Cook for a total of 6 minutes. Turn off the heat and allow to cool slightly.
SERVING. When you are ready to serve, set each mikan cup onto a small serving plate, arrange 4-5 pieces of the reserved mikan wedges on top of the gelee, and garnish with a few mint leaves and a single mint flower if you have some. Serve immediately.