2 tablespoons extra virgin olive oil (EVOO)
1 large onion, chopped
3 cloves garlic, finely chopped or grated
2 cans whole plum tomatoes (28-ounces each), such as San Marzano
9-10 leaves basil, torn
Salt and ground black pepper
2 cups ricotta cheese, skim or whole milk
1/2 cup chopped flat leaf parsley (about a handful)
1 egg yolk
1/2 cup grated Parmigiano Reggiano
2-3 large eggplants (depending on size) or 5-6 large Idaho potatoes, peeled and cut into long lengthwise slices
2 cups shredded mozzarella cheese
Pre-heat oven to 375ºF.
Place a large skillet over medium-high heat with 2 turns of the pan of EVOO, about 2 tablespoons. Add the onion and garlic to the pan, and sauté until tender, 5-6 minutes. Add in the tomatoes, basil, some salt and pepper. Using a wooden spoon or potato masher, crush the tomatoes up to make a chunky sauce. Bring up to a simmer and reserve the sauce warm.
In a large mixing bowl, stir together the ricotta, parsley, egg yolk, Parmigiano Reggiano, some salt and pepper.
Ladle about 1/4 of the sauce into the bottom of a large lasagna pan. Lay down enough eggplant slices to cover the bottom in a single layer. Top with about 1/4 of the ricotta mixture and repeat another layer of eggplant. Continue assembling the lasagna in that order until you’ve used up all the fillings, ending with red sauce. Sprinkle the shredded mozzarella cheese over the top of the dish and cover with foil.
Bake the lasagna for 30 minutes with the foil on, then remove it and continue baking for another 15 minutes until the eggplant is tender and the cheese is browned.