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Slice the eggplant and layer in a colander, sprinkling each layer with salt. Set aside for 30-60 minutes.
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Rinse the eggplant slices under cold running water, then pat dry. This is very important as you don't want them to splatter when they hit the oil.
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Heat 3-4 Tablespoons oil in a frying pan and fry the eggplant slices, a few at a time, for 1-2 minutes each side. Drain on paper towels. You may need to add more oil to the pan for each batch that you fry.
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Preheat the oven to 180C/350°F.
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When you are done frying all the eggplant, add some more oil to the pan and fry the onions until soft, about 5 minutes.
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Arrange the eggplant slices and onions in layers in a greased oven-proof dish, seasoning each layer with salt and pepper.
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Sprinkle with the cheese, parsley and the breadcrumbs, if using.
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Cover with foil and bake for 20 minutes. Remove the foil and continue to bake an additional 20 minutes.
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Let sit 5-10 minutes prior to serving.