Cut the eggplant in half lengthwise. The score each half as shown in the video. Drizzle 2-3 tablespoons of olive oil over each half. Season with salt.
Bake for about 30 minutes or until golden and tender.
Meanwhile make the sauce: heat 1 tablespoon of olive oil over medium heat. Add chopped onion and sauté until lightly golden, add minced garlic and cook for 1 minute. Add crushed tomatoes, season with salt and pepper to tase and cook for 3-5 minutes. Turn the heat off and set aside.
Take the eggplants out of the oven, spread 3 tablespoons of tomato sauce over each half. Then sprinkle some feta cheese and grate some parmesan cheese on top.
Bake for 5-10 minutes, or until the cheese is melted.