2 medium zucchini, sliced in thin (about 1/8-inch) ribbons
2 olive oil
2 cloves garlic, minced
1 medium yellow onion, finely diced
one 16-ounce can whole peeled san marzano tomatoes
2 containers bufala or whole-milk mozzarella
1/2 freshly grated parmesan cheese
Directions
Preheat the oven to 350 degrees. Heat a large saucepan over high heat. Add ground beef, season to taste, turn heat to medium, and cook about 2 minutes, or until the beef is half cooked. Remove from pan and set aside.
While the beef cooks, prepare the zucchini. Set aside.
In the same pan, add the oil, garlic, and onions. Season to taste. Cook onions until translucent, about 5-7 minutes. Add the canned tomatoes and bring to a boil. Reduce to a simmer and purée with a hand blender until only ¼-inch chunks remain.
Spread a thin layer of tomato sauce on the bottom of a 6-by-9-inch (or so) baking dish. Add a layer of zucchini, a layer of ground beef, another thin layer of sauce, then a layer of mozzarella. Repeat again, making sure to fill all the way to the edges. Top with the second layer of mozzarella and a garnish of Parmesan.
Bake at 350 degrees for 20 minutes, then reduce to 300 degrees and cook another 40 minutes, or until half of the moisture has evaporated and the cheese on top is bubbly and golden.