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1
To make the cake: Preheat the oven to 350F and position on a rack in the center.
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2
Grease a 10-cup Bundt pan using nonstick cooking spray or butter, then dust it with flour to coat it completely, tapping out the excess.
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3
Place the walnuts in a single layer on a baking sheet and toast them until they are golden brown and aromatic, 12 to 14 minutes.
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4
Cool the walnuts completely, then finely chop them in the food processor and set aside.
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5
Sift the flour, baking powder, baking soda, salt, and spices into a medium bowl and set aside.
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6
In an electric mixer fitted with the paddle attachment, beat the eggs, sugar, and olive oil together on medium speed until light and fluffy, about 2 minutes, then beat in the vanilla extract.
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7
Scrape down the sides of the bowl with a spatula after each addition.
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8
Beat in the dry ingredients all at once on low speed until they are thoroughly combined, then switch the mixer to medium speed and mix for 30 seconds.
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9
Beat in the zucchini and the walnuts on low speed until they are completely incorporated, scraping down the sides of the bowl.
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10
Pour the batter into the prepared pan, smoothing the top with a spatula.
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11
Bake the cake for 45 to 50 minutes, rotating the pan halfway through the baking time to ensure even browning.
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12
The cake is done when a tester inserted in the center comes out clean and the cake has begun to pull away from the sides of the pan.
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13
While the cake is baking, prepare the glaze: In a medium bowl, whisk together the lemon juice and granulated sugar, then whisk in the confectioners sugar until the glaze is completely smooth.
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14
Allow the cake to cool in the pan for 10 minutes, then carefully invert it into a wire rack.
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15
Using a pastry brush, immediately brush the glaze over the entire surface of the warm cake, using all of the glaze; it will adhere to the cake and set as the cake cools.
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16
Allow the cake to cool completely and the glaze to dry completely.
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17
Transfer the cake to a stand or serving plate and, if desired, lightly dust it with confectioners sugar.
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18
Any leftover cake may be wrapped in plastic and served the following day.
