In large deep stock pot place a rack over 2-3inches of water and bring to simmer.
Toss carrot slices with coriander, cumin, ginger, and red pepper, place on a heatproof plate, and place on a rack.
Cover and steam 4 minutes.
Season fillets with salt and pepper.
Arrange trout fillets over carrots.
Cover and continue steaming 6 minutes longer until the fish is opaque and flakes with a fork.
Transfer 2 fillets each to individual plates and spoon on carrots.
Sprinkle on green onions and drizzle with lemonjuice. lemon juice