Marinate the Pork Belly: Begin by combining the pork belly pieces with the sweet rice wine and a pinch of ground black pepper. Toss well to coat evenly and let it rest for 15 minutes to develop flavor and tenderness.
Soften the Kimchi: In a skillet over medium heat, gently cook the chopped kimchi until it becomes soft and aromatic, about 3-5 minutes. This step enhances its flavor and mellows the acidity. (Alternatively, you can do this directly in the stew pot if it’s roomy enough.)
Assemble Ingredients in Pot: In a medium-sized pot (such as a clay pot or heavy-bottomed Dutch oven), place the marinated pork belly at the bottom. Add the softened kimchi on top, then layer the sliced brown onion, shiitake mushrooms, tofu, and pour in the water.
Mix and Add Seasonings: In a small bowl, whisk together the gochugaru, soy sauce, gochujang, minced garlic, and black pepper. Pour this seasoning mixture into the pot and gently stir to combine all ingredients evenly without breaking up the tofu.
Simmer to Perfection: Place the pot over medium-high heat and bring the stew to a boil. Once boiling, reduce the heat to medium-low and let it simmer gently for 10 to 15 minutes. Occasionally spoon the broth over the ingredients to help the flavors meld evenly and ensure the pork is cooked through.
Finish with Green Onion: Just before serving, stir in the sliced green onion for a fresh pop of flavor and color. Give the stew one last gentle stir, then remove from heat.
Serve Hot: Ladle the kimchi jjigae into bowls and serve immediately, ideally alongside steamed rice and traditional Korean side dishes for a complete meal.