- 8 ounces white mushrooms, halved and thinly sliced
- 3 tablespoons unsalted butter
- 2 large white onions, cut in half lengthwise and thinly sliced
- 1 1/2 cups matzo meal
- 3 carrots, grated
- 2 celery ribs, grated
- 1 tablespoon coarse Kosher salt
- 1/2 teaspoon freshly ground pepper
- 3 large eggs, beaten
- Preheat the oven to 350 degrees F. Butter a 1 1/2- to 2-quart shallow baking dish.
- In a large nonstick skillet, cook the mushrooms over medium-high heat, stirring often, for 5 minutes, or until dry; transfer the mushrooms to a plate.
- Melt the butter in the skillet, add the onions and cook over high heat for 12 minutes, or until nicely browned, stirring frequently during the last few minutes.
- Put the matzo meal in a large bowl and add the onions, mushrooms, carrots and celery. Toss well with the salt and pepper. Stir in the eggs and 3/4 cup of water. Spread the mixture in the prepared baking dish, cover tightly with aluminum foil and bake for 20 minutes. Remove the foil and bake about 20 minutes longer, until the top begins to crisp.