Wash the spinach well and discard the tough stems. Cut into lengths. Blanch in boiling water for 1 to 2 minutes, then set aside on a plate.
Grind the kaffir lime leaf, garlic, palm sugar and grated coconut in a blender until fine and set aside in a bowl, then grind the chilies, dried shrimp paste, salt, lime or lemon juice and water to a smooth paste.