In a large pot add basically everything besides chilli flakes, sesame seeds and salt.
Have the heat on low you want it all to infuse slowly and not burn so about 100-120C temp wise.
Leave this to just bubble gently for like 20mins or more if you want.
Have a large heatproof bowl ready with chilli flakes in it.
Using a strainer carefully pour the oil mixture over the chilli flakes.
Leave to infuse and cook.
Add a few tsp of salt at this point while it's cooling too.