Add the 200 grams pork and 1 teaspoon sake to a bowl and mix well to combine. Add the 1 teaspoon potato starch and mix again to distribute evenly.
200 grams pork, 1 teaspoon sake, 1 teaspoon potato starch
For the 250 grams kimchi, squeeze out as much juice as you can and weigh out 250 grams. You should squeeze it until you can't get any more liquid to come out. You'll probably want to use gloves or your hands will turn orange and smell like kimchi for the rest of the day. This should produce about ½ cup of liquid. If you don't have enough liquid, pour some more in, or if you have too much, pour some out.
250 grams kimchi
Add 2 tablespoons sake and 1 teaspoon potato starch to the ½ cup kimchi juice and stir to combine.
½ cup kimchi juice, 2 tablespoons sake, 1 teaspoon potato starch
Heat a frying pan over medium high heat until hot. Add the 1 teaspoon toasted sesame oil and swirl to coat the pan. Add the marinated pork and spread it out into a single layer. When the pork pieces have browned on one side, flip them over and brown the other side.
1 teaspoon toasted sesame oil
Add the squeezed kimchi and stir-fry until the kimchi starts to brown.
Give the kimchi juice another stir, and then add it to the pan along with the 20 grams garlic chives. Toss to coat everything evenly. The buta kimchi is done when the sauce has thickened. Garnish with the chopped 1 scallion and serve.
20 grams garlic chives, 1 scallion