Add Oolong tea leaves and 4 cups (1,000ml) water into a small pot. Cover the pot with a lid and bring to a boil and simmer on low heat for 5 minutes. Then turn off the heat.
Let the tea leaves continue to infuse in the covered pot for another 5 minutes. Then drain the tea leaves and set aside to cool. You need 700ml (2¾ cups plus 1 tablespoon) of Oolong tea for the bread dough.
For the doughnut batter:
Mix all the wet ingredients together in an electric mixer large mixing bowl, whisk until combined.
In another large mixing bowl, add in all the dry ingredients including the yeast.
Attach the mixing bowl to an electric mixer and then attach the dough hook. Using low speed, mix for about 30 seconds or until ingredients are well combined.
Continue on low speed, gradually pour the wet ingredients mixture in step 1 into the well in the large bowl for about 2 minute.
Stop mixing and then use a rubber spatula to scrape the sides and bottom of the mixing bowl.
Mix on low setting for another 5 minutes or until dough is well combined.
For baking the doughnuts:
Preheat fan-forced oven to 190C or 375F.
Grease all the doughnut pans with some vegan butter.
Spoon and fill each doughnut pan with some batter, until nearly the edge for each pan.
Bake the doughnuts for 15 minutes or until golden brown.
Cool in doughnut pans for 5 minutes, then remove and place on a cooling rack.
For glazing and sprinkling the doughnuts:
Using a baking brush, glaze the smooth side of each doughnut with some pure maple syrup.
Sprinkle all the glazed doughnuts generously with some dried osmanthus flowers.