step 1
Preheat oven to 190C 375F, gas mark 5
step 2
Melt butter in a large saucepan and saute onion and celery for 5 mins stirring occasionally until softened slightly. Stir in flour and cook for 1 minute. Gradually stir in milk, cream and white wine until sauce has thickened. Stir in lemon rind and juice and season to taste.
step 3
Add carrots and simmer for 5 minutes
step 4
Put one third of the sauce into a separate saucepan and set aside. Add all fish and dill into the remaining sauce and simmer gently for 6 minutes. Then stir in half the cheese.
step 5
Put 3 sheets of pasta into base of large ovenproof dish. Spoon over half the fish mixture. Put 3 sheets of pasta ontop and cover with remaining fish mixture.
step 6
Top with last 3 sheets of past and spread with the saved sauce and sprinkle with cheese.
step 7
Bake for 35 - 40 minutes until golden