Preheat the oven to 190/375/gas 5. Heat the oil in a large pan and cook the onion until soft. Add the courgettes, pasta sauce and seasoning. Bring to the boil, reduce the heat and add the fish. Cover the base of an ovenproof dish with a layer of lasagne sheets. Top with half the fish mixture. Repeat the layers, finishing with the lasagne sheets. To make the topping mix together the egg, cottage cheese and fromage frais or yoghurt. Pour over the lasagne and top with the grated cheese. Bake for 45-50 minutes and serve with mini pitta or French bread. DISCLAIMER? Copyright 1996 - SelecTV Cable Limited. All rights reserved. Carlton Food Network http://www.cfn.co.uk/