Heat ¼ cup of neutral oil in a saucepan. Add shrimp or prawn, salt, and fry for 5-7 minutes till cooked through.
Remove from saucepan and drain on paper towel.
Reheat remaining oil and add cumin seeds. Fry for 30 seconds or till aromatic.
Add chopped onion and fry for 5-7 minutes till limp and translucent.
Add crushed ginger and garlic, and fry for one minute.
Add ground spices and fry for one minute, till they stop smelling raw. Add a splash water to deglaze the pan if needed.
Add diced chilies, cilantro, and cooked shrimp/prawns. Fry and coat in the masala for a couple of minutes. Serve with roti or naan.