Finely chop: Add red onion, garlic, and green chillies into a chopper. Chop briefly to maintain a good sambal texture.
Fry: Heat some oil and fry the chopped ingredients until fragrant and aromatic.
Season: Add salt, seasoning powder, and sugar for flavor balance.
Cook Shrimp: Add fresh shrimp, chopped tomato, and oyster sauce. Cook for about 3-5 minutes to avoid overcooking the shrimp.
Serve: Mix well and serve hot with steamed rice.