method
1. Heat the oil in a pan and fry the onions gently until they are softened, but not coloured. Remove from the pan with a slotted spoon and set aside.
2. Stir the flour into the oil in the pan, and cook for 1 minute. Add the milk gradually, beating well between additions. Simmer gently for 2 - 3 minutes, stirring continuously
3. Add the onions to the sauce and season well to taste.
4. Cut the eggs in half and remove the yolks. Push the yolks through a metal sieve and set the sieved yolks to one side.
5. Rinse and chop the egg whites and place them in the bottom of a medium-sized ovenproof dish, or 4 individual ramekins.
6. Cover the chopped egg whites with the onion mixture and then top this with a layer of sliced tomatoes.
7. Put the breadcrumbs and Parmesan cheese into a mixing bowl, and stir in the sieved egg yolks, mixing well, until all the ingredients are thoroughly incorporated. Sprinkle this over the layer of tomatoes.
8. Bake in a preheated oven, 200°C/400°F/Gas Mark 6, for 15-20 minutes, or until golden brown.
serving amount
serves 2 - 4
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