This recipe and others can be found in the following article:
1 tablespoon shrimp paste (trassi)
2 tablespoons chopped red chiles, such as cayenne
1 tomato, chopped
2 teaspoons brown sugar
1 tablespoon lime or lemon juice, fresh preferred
1 teaspoon salt
To toast the trassi, spread the paste on a piece of foil and fold to seal. Place under a broiler for 2 minutes. Remove and cool.
Combine all the ingredients in a blender or food processor and puree until smooth.
Serve this sambal at room temperature.