Salt the cleaned fish well, and let it sit for 1 hour.
Grease a heatproof dish thickly with butter, sprinkle with paprika, and place the fish in the center.
Meanwhile, prepare the braised rice: sauté the rice in butter, pour in the broth, and simmer, covered, for about 15-18 minutes, until tender and the liquid is absorbed.
Arrange the cooked rice evenly on both sides of the fish, and divide the cooked green peas into three small mounds.
Top each mound of peas with a pinch of the finely chopped, blanched red pepper.
Spoon 6-7 tablespoons of sour cream over the fish.
Roast in a 190°C oven for about 45 minutes.
Meanwhile, cook the cauliflower in salted water, drain, and sprinkle with butter-toasted breadcrumbs.
Serve the fish hot, in its roasting dish, garnished with the cauliflower.
Based on: Malatinszky Fanny szakácskönyve (a classic Hungarian cookbook), modernised. Calories and protein are estimated.