Add 1 teaspoon salt and ⅛ teaspoon baking soda to ¼ cup water and mix until dissolved.
1 teaspoon salt, ⅛ teaspoon baking soda, ¼ cup water
Add 1 tablespoon vegetable oil to a heavy-bottomed pot such as a Dutch oven and heat over medium-high heat until the oil is shimmering (but not smoking).
1 tablespoon vegetable oil
Add 800 grams boneless skin-on chicken thighs in a single layer with the skin-side down and fry undisturbed until the skin is browned and crisp (about 3 minutes). Flip the chicken over and brown the second side.
800 grams boneless skin-on chicken thighs
When the chicken is browned on both sides, remove it from the pan and add grated 30 grams ginger and 20 grams garlic. Saute until you have a thick layer of brown fond on the bottom of the pot and the mixture is caramelized.
30 grams ginger, 20 grams garlic
Add 600 grams onions along with the baking soda solution and quickly stir to coat the onions evenly with the mixture. Cover the pot with a lid and reduce the heat to low, allowing the onions to steam for 10 minutes.
600 grams onions
Remove the lid and turn up the heat to medium-high, boiling the mixture until very little liquid is left.
Add the grated 70 grams carrot and fry the mixture by stirring, then spreading the vegetables into an even layer and then stirring again until the onions are fully caramelized and the mixture is cinnamon brown.
70 grams carrot
Add 24 grams Japanese Curry Powder and stir until it is very fragrant (about 1 minute). Be careful not to burn it.
24 grams Japanese Curry Powder
Add the4 cups vegetable stock and 1 banana, and then use a stick blender to puree the mixture until smooth.
4 cups vegetable stock, 1 banana
Now, you want to return the chicken to the pot with 400 grams potatoes, 300 grams carrots, 2 tablespoons soy sauce, 1 tablespoon chunou sauce, 1 tablespoon tomato paste, 1 bay leaf, 1 star anise, and 2 teaspoons cocoa powder.
400 grams potatoes, 300 grams carrots, 1 bay leaf, 1 star anise, 2 tablespoons soy sauce, 1 tablespoon chunou sauce, 1 tablespoon tomato paste, 2 teaspoons cocoa powder
Adjust the heat to maintain a gentle simmer, and then let this cook until the carrots and potatoes are tender (about 1 hour). You'll want to mix the curry every 10 minutes to ensure it is not burning to the bottom of the pot.
The Japanese curry is done when the vegetables and chicken are tender, and the sauce is like a thick gravy. Taste the curry and adjust the seasonings with salt and cayenne pepper to taste. If you like a looser curry, add water or stock to thin it out.
To make Japanese curry rice, just serve your homemade chicken curry over Japanese short-grain rice.