Soak sweet chilli peppers for 30 minutes, then mince them into a paste.
Finely cut lemongrass, lime tree leaf, turmeric root, galangal, and place into the mortar, along with garlic and hot chilli pepper.
In the mortar, use the pestle to crush the above into a paste.
Dice the beef into small, half-inch (1.25 cm) cubes.
Pour the coconut milk into a pot (we use a 5-quart pot for this recipe) and heat until boiling over medium heat.
Add the sweet chilli and lemongrass pastes to the boiling coconut milk and mix well.
Throw in the beef and mix well.
Once the mix boils again, add the seasonings – salt, MSG, and sugar.
Add water to the pot, mix well, and bring to a boil.
Switch to low heat and allow the curry to simmer for 30 minutes, stirring occasionally. For softer beef, you can keep the curry simmering longer.
Serve over rice, with a French baguette, or any other white bread.