Haddock with onion

2 lbs haddock fillets , cut into 4 8-ounce portions 2 tablespoons lemon juice (about 1/4 lemons) salt 1 tablespoon olive oil 1 tablespoon softened butter 6[...]

500 g potatoes 300 g haddock 300 g smoked haddock 300 ml milk 1 lemon 4 tablespoons parsley 4 spring onions 4 tablespoons capers 2 eggs 15 g butter 150 g[...]