Directions

1. Make the chocolate cake
2. Set a rack in the middle of your oven and heat to 350 F. Use the 1 teaspoon of butter to grease two 9" round cake pans. Divide the 1 tablespoon of cocoa powder between the pans and swirl it around the pan to evenly coat the bottom and sides. Bang out any excess cocoa powder.
3. In a medium bowl, sift together the flour, baking soda, baking powder, and salt.
4. Heat the whole milk to just below a boil (you can do this on the stove or, more easily, in the microwave). Put the cocoa powder in a smallish bow, pour the hot milk over it, and whisk until the cocoa is fully dissolved. Add the coconut milk and whisk to combine.
5. Put the butter, turbinado sugar, and granulated sugar in the bowl of a standing mixer fitted with the paddle attachment. Beat on medium-high speed for 3 minutes, making sure to scrape down the sides of the bowl every minute. Add the eggs and beat on medium-high speed for 30 seconds. Add the ginger and vanilla and mix until combined. Add the ginger and vanilla and mix until combined.
6. Add 1/3 of the flour mixture and mix on low speed until just barely combined. Scrape down the sides of the bowl, then add 1/2 of the cocoa-milk mixture. Mix on low speed until barely combined. Repeat with the remaining flour and milk, ending with the flour.
7. Divide the batter between the two prepared pans. Bake until a toothpick comes out clean, 22-24 minutes. (Note: my oven is crazy, and I've found that my baking times are often very different from what's noted in a recipe. Use your senses to determine if/when the cake is done - the timer is just a reminder to check on it.)
8. Place the pans on a wire rack to cool for 20 minutes, then invert the pans and let the cakes cool fully directly on the rack.
9. Make the ginger simple syrup
10. Put the granulated sugar, water, and ginger in a small saucepan. Bring to a boil, then simmer for 5 minutes. Let the mixture cool completely, then pour it through a small sieve and discard the ginger pieces.
11. Make the ganache (I recommend doing this before baking the cakes, as it takes several hours for the ganache to set)
12. Cut the stem end off the chiles and slice each one into quarters lengthwise. Tear the kaffir lime leaves into a few pieces each. Add the chiles, lime leaves, and cream to a small saucepan and bring to just below a boil. Turn off the heat, cover the pan, and let the cream steep for 15 minutes.
13. Finely chop the chocolate and put it in a medium bowl.
14. Bring the cream to a bare simmer, then pour it through a sieve directly onto the chocolate. Let the cream sit for 30 seconds, then gently but thoroughly whisk the mixture to melt all of the chocolate. Let the ganache sit at room temperature until it is firm but spreadable, about 2 hours. Alternately, you can put the bowl in the fridge, but make sure to stir it every 10 minutes so that it doesn't get too hard.
15. Make the green curry buttercream
16. Fill a medium saucepan with 2" of water and bring the water to a simmer. Put the egg whites and sugar in the bowl of a standing mixer. Place the bowl on top of the saucepan and whisk constantly until the sugar is fully dissolved, about 3 minutes. Transfer the bowl to the mixer and, using the whisk attachment, beat on high speed until the whites are glossy and hold stiff peaks and the bowl is cool to the touch, about 6 minutes.
17. Cut the butter into 1/2 tablespoon size pieces. With the mixer running, add the butter a few pieces at a time, making sure that the previous addition is fully incorporated before adding more butter. After you've added all of the butter, continue mixing on high speed until the frosting comes together. It's a moment of alchemy - it will look soupy and curdled after you add all the butter, but have faith (and patience) - it will come together.
18. Add the green curry paste and mix for 10 seconds on medium-high speed to evenly incorporate it.
19. Make the coconut milk peanuts
20. Coarsely chop the peanuts - I prefer doing this by putting the peanuts in a ziploc bag and smashing them with a rolling pin. Very therapeutic.
21. Transfer the peanuts to a small bowl and heat them in the microwave for 1 minute, stopping halfway through to stir the peanuts. Add the coconut milk powder to the hot peanuts and stir well to combine.
22. Assemble the cake
23. If the tops of the cakes are domed, use a large serrated knife to level them.
24. Put a little dab of frosting on a cake round or serving plate and place one cake on it with the bottom facing up. Using a pastry brush, generously brush the ginger simple syrup over the top of the cake. (I usually give it three good passes.)
25. Spread the ganache on the cake in an even layer. Top with the remaining cake (again, the bottom side of the cake should be facing up). Brush the cake with the ginger simple syrup - you may not need all of it.
26. Spread the frosting on the top and sides of the cake. If you want to be meticulous, you can first spread on a crumb coat (a very thin layer of frosting on the entire cake), chill the cake for a half hour, then top it off with the remaining frosting. I rarely do this as I am too lazy to do so unless my cake is for someone else - sorry family, you don't get a crumb coat.
27. Sprinkle the peanuts on top of the cake.
28. Cut yourself a big slice and, as you chew on the first bite, marvel at how the green curry in the frosting makes complete sense with all the other flavors in the cake and ganache.