Stir together the chicken stock, soy sauce, chunou sauce, honey, and cocoa powder in a bowl.
Grate the onion, carrot, garlic, and ginger into a pan. You can also use a food processor or blender to do this, but it's important the vegetables are fully pureed.
To prepare the katsu, cut slits into each pork chop about 1/3 of the way down, spaced 1/4-inch apart. Flip the cutlets over and then repeat the cuts at the same angle.
Place a sheet of plastic wrap or parchment paper over the meat, and use a heavy object such as a mallet, rolling pin, or pot to pound the cutlet out until it's doubled in size.
Season both sides of the pork with salt and pepper and then dust with an even coating of flour.
Beat the egg until uniform in one tray or shallow bowl, and then add the panko to another.
Dip each cutlet in the egg so there are no dry spots, and then place them in the panko, scooping the panko on top and gently patting to help it adhere. Next, flip the cutlets over in the panko a few times, repeating the scooping and patting process until each one is evenly coated.
Preheat a pot with about 1-inch of oil to 340 degrees F (170 C) and line a cooling rack with a few layers of paper towels.
To make the curry sauce, put the pan with the grated vegetables on the stove and turn it on to high heat. Stir in the baking soda and continue boiling the mixture until most of the liquid has evaporated (about 5 minutes).
Turn down the heat to medium and add 2 tablespoons of vegetable oil. Fry this mixture while constantly stirring until it is caramel brown and forms a thick paste (about 3 more minutes).
Add the curry powder and quickly stir it into the vegetable paste to toast it, but be careful not to burn it.
Stir the chicken stock mixture in and turn down the heat to maintain a gentle simmer.
To fry the katsu, add the breaded cutlets to the preheated oil and fry until golden brown. Flip them over periodically to ensure they brown evenly. If your pot doesn't hold both cutlets comfortably, just fry them one at a time. Drain on the prepared rack.
Your curry should be nice and thick at this point, so give it a taste and adjust the seasoning as needed. If the curry is too thick or too salty, just add some water to thin it out.
Slice up the katsu and serve it over rice. Pour the curry sauce over half of the katsu and serve immediately.