Let the water boil.
Once boiling, add onion, Korean radish, ginger, scallions, and garlic, and place the pork belly in there.
Season with bay leaf, peppercorns, salt, soybean paste, coffee grounds, and soju.
Let boil for 10 minutes in high heat, making sure the pork is fully submerged.
Continue to boil for 50 more minutes on medium-high heat.
To check if it’s done, poke it with a chopstick. If it comes through quickly, it is done.
Remove the pork belly from the pot and place it in the cold bath right after. Set it to sit in cold water for about a minute.
Slice and serve with kimchi.