Gather all the ingredients.
Fill a stove-top pot with enough water to fully submerge the pork belly. Bring it to a boil and then add the pork belly, sake, and salt. Reduce the heat to low, cover the pot, and let it cook for 40 minutes.
In a small frying pan over medium heat, add 1 teaspoon of neutral cooking oil and sliced garlic. Cook until browned on both sides, approximately 1-2 minutes. Then, transfer the garlic to a bowl. Note - no preheating of the oil is necessary.
While waiting for the pork belly, cut ginger into julienne slices and set aside.
Mince umeboshi so it becomes nearly paste like and set aside.
After 40 minutes, remove pork belly from water, place on cutting board and cut into bite-size pieces that are about 1/2 in width. Discard the liquid.
Heat high-temperature neutral cooking oil in a frying pan over high heat. Once the oil is preheated, carefully place the pork belly, skin side down, into the oil.Sear for 1-2 minutes until a golden crust forms, without moving the meat. Then,flip and repeat the process on the other side. No need to sear the sides.
Once both sides are seared, transfer to a serving plate. On top of each pork belly, add in the following order, minced garlic, umeboshi, julienne ginger, and a sprinkle of toasted sesame seeds.