Cut the pork belly into chunks 1-2cm thick across the strip.
Heat a wok over a medium-low heat and add the pork; there is no need for any oil. Stir the pork every couple of minutes. This process will take about 20 minutes.
Cut the red pepper into a 1cm dice.
Bash the piece of ginger with the side of a knife to bruise it.
Bash the lemongrass with a knife to bruise it.
Once the pork is nicely browned, remove it and place it in a bowl.
Add the brown sugar, soy sauce and fish sauce and stir.
Once the sauce begins to bubble add the star anise and chilli peppers and stir for 30 seconds.
Return the pork to the wok along with the red pepper, lemongrass and ginger, then pour over enough water to cover the pork by around 5-6mm (¼"). Sprinkle in the MSG and stir to combine.
Turn the heat up to medium and cook for 45-50 minutes at a medium boil until almost all of the liquid has reduced and you are left with a viscous and shiny coating on the pork.