Pickle Cabbage: Separate napa cabbage leaves and wash. Add salt, sugar, vinegar and water to create a brine. Toss leaves well and turn over every 15 minutes.
Sear Pork Belly: In a pan with oil on medium heat, sear pork belly until nicely browned. Flip over and sear all sides.
Add Rest of the Ingredients: Toss in onion, garlic, ginger, instant coffee and doenjang. Mix well and add water to cover pork belly.
Simmer Until Tender: Lower the heat to medium-low, cover (lid slightly ajar), and cook for 1 hour, or until the pork is very tender and a knife slides in with little resistance.
Rest and Slice: Transfer the pork to a board and rest for 10 minutes. Slice across the grain into 1/4-inch pieces.
Serve: Serve warm with pickled napa cabbage, kimchi, rice, and ssamjang on the side for wrapping. Enjoy!