Because it keeps well, this sauce was traditionally used by travelers.

Heat the oil in a large skillet to 375øF. Deep-fry the fish fillets until very crispy and golden brown.
Charcoal-broil/grill the chilies, garlic and shallots until their outsides are charred. Remove the garlic and shallot skins.
Place the fried fish, chilies, garlic and shallots in a mortar and mash with the pestle until smooth, or use the blender.
Place the shrimp paste, fish sauce and palm sugar in a small saucepan and cook for about 15 minutes on medium-high heat, so that the mixture is reduced to a paste.
Thoroughly combine the mashed ingredients with the reduced sauce ingredients. Store in a jar with a tight-fitting lid and use as a dipping sauce or for cooking

From: http://www.bangkok.com/larry/index.html
Posted By: Randy, rock4u@rocketmail.com
Post Date: Sun, 10 May 1998