Preheat the oven to 375°F (190°C).
Prepare the sauce:
- Blend the onions, tomatoes, garlic, olive oil, salt and pepper in a blender or food processor until only slightly chunky.
- Pour into a medium pan. Add the tomato paste, water, bay leaf and oregano. Stir well.
- Cook, covered, over medium heat until the mixture simmers. Lower the heat and continue cooking, uncovered, until the sauce is thick and savory; about 1/2 hour.
- Adjust salt and pepper if desired.
- In the meantime, slice the eggplant thickly. Rinse the slices and drain.
- Drag the eggplant slices through the seasoned flour and place them on a generously greased baking pan. Or line the pan with baking parchment.
- Dribble a little olive oil over each eggplant slice.
- Bake for 15 minutes or until tender and getting crisp at the edges. Don’t turn the oven off yet.
- Remove the bay leaf from the sauce.
- Place a slice of halumi or mozzarella over each eggplant slice. Cover with a large spoonful of tomato sauce. Cover each slice with grated cheese.
- Bake the slices 5-10 minutes, or until the halumi or mozzarella is melting.
- Serve hot, with lemonade for the kids and the aforementioned chilled rose wine for the grownups. (Beer is good, too.) This recipe is easily doubled.