Sift together the flour, sugar, baking powder, salt and baking soda in a medium bowl. Add the diced cold butter and toss with the dry ingredients. Refrigerate for 30 minutes.
While the mixture chills, blanch the basil and cilantro. Prepare an ice water bath and bring a small pot of water to a boil. Immerse the basil and cilantro in the boiling water for about 1 minute, and then transfer the herbs to the icy bath.
In a blender, add 1/4 cup of the coconut puree and the lemon grass and blend until smooth. Next, add another 1/4 cup of the coconut puree, the coconut rape, ginger and kaffir lime leaves and blend until smooth. Finally, add the blanched herbs and the remaining 1/4 cup coconut puree and blend until the mixture turns a light vibrant green. If at any point the mixture feels warm, transfer it to the freezer to cool off; this will keep the herbs from turning brown. Transfer 1/2 cup of this mixture to a small bowl and whisk in the cream.
Preheat the oven to 350 degrees F.
In a heavy-duty mixer fitted with a paddle attachment, mix together the chilled dry scone ingredients and diced butter on medium-low speed until the butter has broken down into pea-size pieces. Mix in the coconut flakes, dried mango and crystallized ginger. Next add the green herb-cream mixture in 1/4-cup increments until just incorporated, being careful not to over-mix the dough.
Turn the dough out onto a lightly floured work surface and roll out 1 1/4 inches thick. Cut into 3 1/2-inch squares, and then cut each square on the diagonal, forming two triangles per square. Place the triangles on a baking sheet. Brush the top of each triangle with the egg wash, and then garnish with a thin layer of coconut rape.
Bake the scones until golden brown and firm to the touch, 30 to 40 minutes.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.