Sprinkle cooked fish with lemon juice, salt and pepper. Cut leek into rings of 0.5 centimeters. Lay leek out on 2/3 of heat-resistant form, place the fish on top and cover with the remaining leeks and cherry tomatoes. Pour the cream, sprinkle with crumbled feta and dried herbs, drizzle with olive oil. Bake 30 minutes in oven at 180 degrees Celsius.