For the eggplant, salt the rounds lightly with kosher salt.
Allow the salted eggplant slices to rest on paper towels and drain out their bitter liquid for roughly 15 minutes.
Pat each piece of eggplant dry with paper towels.
Season each eggplant slice a bit more Kosher salt and some freshly-ground black pepper.
Coat each slice in all-purpose flour. Shake off any excess flour.
Whisk together the eggs into a shallow bowl.
Dip each piece of floured eggplant in the whisked egg mixture.
Coat each piece of dipped eggplant with breadcrumbs, shake off the excess, and set aside for pan-frying.
Heat the vegetable oil in a pan suitable for frying over medium heat.
Once the oil is hot, but before it is smoking, add the breaded eggplant slices in stages and fry until golden brown on each side.
Place the fried eggplants on a paper towel-lined plate to drain off the excess oil.
Season with Kosher salt once the eggplant slices come out of the hot oil.
For the tomato sauce, heat the olive oil in a saucepan over medium heat.
Add the chopped onion and minced garlic, and cook over medium heat until they become translucent, stirring frequently.
Add the canned diced tomatoes, dried oregano, Kosher salt and freshly-ground black pepper.
Reduce the heat to low, and let the sauce simmer for about 20 minutes, stirring occasionally.
While the sauce is simmering, prepare the polenta.
Bring the water to a boil in a pot and slowly whisk in the polenta.
Reduce the heat to low and continue stirring until the polenta becomes thick. This should take about 15-20 minutes.
*The polenta will be thicker than your traditional, more soupy polenta mixture.
Stir in the grated Parmesan cheese and butter into the polenta until well combined.
Spread the polenta in a thin layer on a baking sheet lined with parchment paper, and allow it to cool in the fridge.
Once the polenta is cooled and firm, cut it into squares or triangles.
Heat the olive oil in a skillet over medium heat and pan fry the polenta pieces until they are golden and crispy.
To assemble the dish, place a few pieces of crispy polenta on a plate, top with a slice of fried eggplant, and spoon some tomato sauce over the top.
You can add an extra sprinkle of Parmesan cheese on top, if desired.