Sambal Belacan is a sauce or paste based on dried shrimp paste made in Malaysia and Singapore.
You toast dried shrimp paste, and purée it with chopped, seeded red chiles, season it with salt and pepper, and adjust taste with lime juice.
Sambal Belacan is used as a condiment in cooking or at the table. It can also act as the basis of other sauces such as sambal kangkung (water spinach sambal.)
Older people might still make Sambal Belacan in a mortar, but everyone else uses a blender now.