This rich casserole with ricotta and Parmigiano- Reggiano should be cooled at least 20 minutes so it can be cut into squares when served.
6 medium zucchini
1 teaspoon salt
1 tablespoon unsalted butter
1 medium onion, fi nely chopped
3 large eggs plus 1 large egg white, whisked until fairly smooth in a small bowl
3⁄4 cup fi nely grated Parmigiano-Reggiano
1⁄2 cup regular or low-fat ricotta cheese (do not use fat-free)
1⁄2 cup plain dried bread crumbs
1 tablespoon chopped dill fronds or
2 teaspoons dried dill
2 tablespoons canola oil
How to make
Baked Zucchini Casserole
Shred the zucchini through the large holes of a box grater. Toss with the salt and place in a colander in the sink to drain for 15 minutes.
Squeeze out as much of the moisture from the zucchini as you can, working in batches. Place the zucchini in a large bowl; set aside.
Position the rack in the center of the oven and preheat the oven to 375°F.
Melt the butter in a large skillet over medium heat. Add the onion, reduce the heat to low, and cook, stirring often, until soft and golden, about 7 minutes.
Pour the contents of the skillet into the bowl with the zucchini. Cool for 5 minutes, then stir in the beaten eggs and egg white, the Parmigiano- Reggiano, ricotta, bread crumbs, and dill.
Place the canola oil in a 9-inch square baking pan; tilt the pan so the oil covers its bottom and sides. Place the oiled pan in the oven for 5 minutes to heat it through.
Pour in the zucchini mixture, spread it evenly to the sides, and bake until slightly mounded, a little browned, and set when tapped, about 50 minutes. Set the pan on a wire rack for at least 20 minutes. Once fully cooled, the casserole can be covered with plastic wrap and stored in the refrigerator for up to 3 days. Cut the casserole out of the pan in squares.