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["Place grated zucchini in colander set over large bowl. Sprinkle with 3/4 teaspoon salt and toss to coat. Let drain at least 30 minutes. Working in batches, squeeze zucchini in kitchen towel to remove as much liquid as possible. It's important that the zucchini is dry.", "While the zucchini is draining, blanch the trimmed asparagus spears in boiling water for 3 minutes. Plunge into ice water to stop cooking, cool, and dry thoroughly on paper towels.", "Melt 2 tablespoons butter with oil in heavy large skillet over medium heat. Add onion and saute until soft and translucent, about 7 minutes.", "Add garlic and saute until fragrant, about 30 seconds.", "Add zucchini and lemon juice; reduce heat to medium-low and cook until zucchini is tender, and mixture is dry, stirring occasionally, about 12 minutes. Cool to room temperature.", "Whisk ricotta cheese, 1/3 cup Parmesan, egg, lemon peel, 1/2 teaspoon pepper, and remaining 1/2 teaspoon salt in medium bowl. Stir in cooled zucchini mixture.", "Preheat oven to 400u00b0F. Line a large baking sheet with parchment paper or Silpat. On a lightly floured surface, roll out 1 pastry to a 10"" x 15"" rectangle, 1/8-inch thick and transfer to baking sheet.", "Trim 1 inch of pastry from each edge of the rectangle and set aside next to its edge. Wash the rectangle along each border with the egg wash, and then top with the piece of trimmed pastry, creating a raised edge. Overlap the corners.", "Spread zucchini filling evenly over pastry, filling the pastry box.", "Arrange the asparagus spears decoratively on the top of the filling.", "Apply the egg wash to the raised borders, sprinkle with the remaining 1/4 cup of cheese and some fleur de sel or kosher salt.", "Bake for 30 - 35 minutes until puffed and golden. Let rest at least 5 minutes before serving. Can be made ahead and reheated."]
