This curry is a little thinner than the variety enriched with coconut milk, but the absence of fat lets the flavor of the curry paste and the fish come through. For a coconut-based curry, see Thai Shrimp Curry, which may be made with chunks of any firm-fleshed white fish.
Heat in a large, deep skillet over medium heat until shimmering:
Add:
The paste will splatter a lot in the oil, so have a splatter screen handy, if possible. Fry the paste, stirring constantly, until the oil is tinted the color of the curry paste and the mixture is very fragrant, about 2 minutes. Stir in:
Scrape any browned bits off the bottom of the skillet. Bring to a simmer and add:
Place in the simmering stock:
Simmer gently, turning once if the fish pieces are thick, until the fish is cooked through, 5 to 7 minutes. Serve over: