Remove 1–2 outer layers from 2 stalks of lemongrass.
Cut off the top and bottom ends.
Crush the lemongrass with the side of a knife and set aside the upper part for later.
Place the crushed lower stalks into a food processor along with garlic, shallots, and ginger.
Blend until finely chopped or into a rough paste. You can also use a chopping board or pestle and mortar if you prefer.
Transfer the mixture to a bowl and season with salt, sugar, fish sauce, and a little water. Mix well and set aside.