Crumble the trassi, using a mortar if needed, and add it. Add the fish sauce at this stage as well.
2 teaspoons trassi, 1 teaspoon fish sauce
Add the lemongrass (lightly crush, bend and twist it) and let it simmer with the rest.
1 stalk fresh lemongrass
Simmer for another half hour, adding water if necessary.
Transfer the sambal while still hot to a clean small glass jar with a lid (or, for example, a small preserving jar). Stir well with a spoon to prevent air bubbles, then seal immediately.
Once cooled, refrigerate.
Notes
The calorie count shown is for one entire small jar, without sugar, candlenuts, trassi or fish sauce.Equipment: large PFAS-free frying pan, (small) food processor, mortar, grater, clean small jar, small saucepan (with a handle) (optional, if sugar is used).