Remove the silverskin membrane from the ribs if it has not already been removed. Cut ribs into individual pieces.
Take out a large pot. Place the ribs in.
Then quarter onion into 4 pieces.
Place into the pot: Onion (4 pieces), Garlic (10 cloves), Ginger (2 small pieces), Soju (4 Tablespoons), Mirin (3 Tablespoons), Sugar (½ Tablespoon), Espresso (1 shot), 4 Bay Leaves & Whole Black Peppers (1 Tablespoon)
Then fill the pot with hot water - just enough to submerge the ribs (reference video).
Place on a lid and bring the pot up to a boil. Once it's boiling, set a timer for 40 minutes.
(If using a pressure cooker pot, please reference cooking notes)
After 40 minutes of boiling, the ribs should be soft enough to bite through. (It should not be fall-of-the-bone tender)
Now, use a sieve and take out the ribs. Let them cool on a plate.