STEP 1/6
Beat the eggs in a bowl and mix well with sugar. Place the ball in hot water and whip it with a hand mixer to make foam.
STEP 2/6
If you feel warm after touching the dough, take it out of the hot water and keep whipping to lower the temperature of the dough.
STEP 3/6
It's done when the dough starts to bubble up, and when you lift it up, it starts to fall down slowly in a ribbon shape. Remove large bubbles by stirring at low speed for about a minute.
STEP 4/6
Heat the mixture of mirin, milk, and honey in the microwave for about 2 minutes, then put it in the egg mixture and stir it at low speed for about 1 minute. Add the sifted powder and mix with a rubber spatula, scooping from bottom to top. You have to do it quickly so that the bubbles don't die.
STEP 5/6
Place the dough in a mold, flatten the top side, and gently drop the mold 2-3 times to remove air bubbles. Place in a preheated oven at 170 and bake for 15 minutes, then lower the temperature and bake for 20 minutes at 155.
STEP 6/6
When it's done, cover the top with a paper foil slightly covered with grape seed oil and turn it over into a mold. Remove the mold and turn it upside down to cool it down.
I used strong flour, so the castella feels a bit sticky. If you use gravity flour instead of strong flour, you can enjoy a softer texture of castella.