To Prep
In a sauce pan over a medium heat, fry the onions until they become soft. Add in the crushed garlic, chilli sauce, fish sauce, palm sugar and stock stir well.
Allow the mixture to simmer until most of the stock has evaporated from the sauce. Remove the pan from the heat and let cool slightly.
When the sauce has cooled slightly, spoon a portion of the sauce on to each of scallops and set aside.
To Cook
Heat a grill or barbecue and place the scallops on to it. Continue to grill until the scallops have cooked through. Remove them from the heat and let cool.
Garnish with herbs and serve!