Roll it in whichever direction you prefer, the important thing is that the skin is on the outside
Using butcher's twine, tightly tie the pork belly at intervals of about 2 cm
Preheat the oven to 135°C
In an oven-safe pot, place the broth ingredients
30 g of fresh ginger, 30 g of garlic cloves, 4 young onions, 200 ml water, 165 ml of sake, 125 ml light soy sauce, 100 g of brown sugar, 220 ml of mirin, 1 star anise, 1 shallot, 0.5 stick of cinnamon, 0.5 lime
Heat over medium-high heat until boiling
Add the pork, it's normal that it's not completely submerged
1 kg of unsalted pork belly
Cover with a lid, leaving it slightly ajar (or use aluminum foil, but in that case, cover it tightly)
Transfer to the oven, still at 135 degrees, and cook, turning the pork occasionally, until it's completely tender, for 3 to 4 hours
Put in an airtight container (with the broth) and refrigerate until cooled. Feel free to add soft-boiled eggs to marinate for your ramen as well
Before serving, strain the broth and set it aside. It can still be used.
Slice the pork into thin rounds
To reheat, place the slices in your ramen broth before serving
Notes
The cooling step is really important to ensure a flavorful and juicy result. Moreover, right after hot cooking, the meat is too hot to be sliced properly