If there is any skin on the pork belly, take it off before cutting meat into chunks of a similar size to the diced venison. Place both the venison and pork in a deep pot, cover with cold water and bring to a boil. Once the water has reached boiling point, take the meat out and place on a tray.
Discard the water in the pot, wash it out and place the meat back in. Then, add all the ingredients, apart from the spring onions and coriander, and simmer with a lid on until well-cooked. The venison should fall apart easily.
Take out the meat and strain, but do not discard the liquid this time. Add salt if needed. Finely chop the meat, coriander and spring onions, then mix together. Strain the stock and add to the meat to correct seasoning.
Combine all the bun ingredients until you have a dough, then knead for 10 minutes. Leave to rise until it has doubled in size. Knead again for 5 minutes and divide into 12 equal pieces.
Roll all the dough pieces into cigar shapes, then stretch into long, narrow strips. Fold in half lengthways and roll up with the end piece tucked underneath. Turn on the side and press the dough down in your hand. Roll out into a disc and allow to rest for 20 minutes.
Put the discs in a hot, dry frying pan and cook with the lid on for 2 minutes on each side. Then remove the lid and continue cooking until the buns turn golden brown on each side.
To serve, cut a pocket into the bun and fill with the chopped meat mixture, enjoy!