Peel and chop galangal, turmeric, and ginger into small pieces.
Remove the outer layers of the lemongrass, then finely slice the tender inner stalk.
Lightly toast the coriander seeds in a dry pan until aromatic, then let them cool.
Add the garlic, shallots, lemongrass, galangal, turmeric, and ginger.Pound until a coarse paste starts forming.
Add the green chilies, coriander roots, and kaffir lime leaves.Continue pounding until smooth. This process takes 10–15 minutes with a mortar and pestle but develops a richer flavor.
Add the shrimp paste and mace, blending them evenly into the paste.
Use the paste fresh, or store it in an airtight container in the fridge for up to a week.For longer storage, freeze in small portions for up to 3 months.