Smoked Haddock Gratin

haddock 28.0% , milk 12.2% , potato 5.1% , cream 3.6% , cheddar 3.6% , spinach 3.6% , crème fraîche 3.6% , breadcrumbs 3.6% , butter 3.6% , onion 3.6% , white wine 3.6% , wheat flour 3.6% , parsley 2.1% , rapeseed oil 2.1% , lemon juice 2.1% , dill 0.2% , fish stock 0.2% , garlic puree 0.2% , white pepper 0.0% , salt 0.0%