4 tablespoons extra virgin olive oil (EVOO), divided
1 medium onion, finely chopped
2 cloves garlic, finely chopped
1 can whole plum tomatoes (28 ounces), such as San Marzano
1 cinnamon stick
Salt and freshly ground black pepper
5-6 leaves fresh basil, torn, plus additional for garnish
4 medium eggplants, thinly sliced
1 quart ricotta cheese
1 1/2 cups grated Parmigiano Reggiano, divided
2 egg yolks
2 1-pound balls smoked fresh mozzarella, thinly sliced
Pre-heat the oven to 375ºF and pre-heat a grill to medium-high. Place a medium size pot over medium-high heat with two turns of the pan of EVOO, about 2 tablespoons. Add the onion and garlic to the pan and cook until tender, about 3-4 minutes. Add the tomatoes to the pan and break them up with a wooden spoon or potato masher. Add the cinnamon stick, salt, pepper and the basil to the pan and simmer the sauce until thickened and aromatic, about 10 minutes. While the sauce is simmering, brush the eggplant slices with the remaining EVOO and grill them until they're marked from the grill and tender, about 5 minutes per side.
Meanwhile, combine the ricotta, 1 cup Parmigiano Reggiano cheese and egg yolks together in a medium bowl. Reserve. When everything is ready, spread a thin layer of sauce in the bottom of a baking dish. Top with a layer of eggplant slices and spread half of the ricotta mixture over the eggplant. Top with another layer of eggplant and layer one third of the mozzarella over the eggplant. Top with some sauce and then more eggplant.
Spread the remaining half of the ricotta mixture and top with another layer of eggplant. Top with another third of the mozzarella and sauce, and then with the remaining eggplant. Scatter the remaining mozzarella over the top and sprinkle with the remaining grated cheese. Place the casserole dish on top of a baking sheet (in case it bubbles over) and bake until golden brown and bubbly, about 45 minutes. Garnish with basil and serve. This is one of many "Yum-o!" recipes – it's good and good for you. To find out more about Yum-o!, Rachael's nonprofit organization, go to www.yum-o.org.