Step 1

To make the cake, preheat the oven to 350º F (180ºC.) Butter a 9- to 10-inch (25 cm) springform pan and line the bottom with a round of parchment paper.

Step 2

Grind the citrus zest in a food processor with the 1 1/2 cups of sugar until it’s finely ground. (No need to clean the bowl afterward as you’ll use it in step #4.)

Step 3

In the bowl of a stand mixer, or by hand, beat the butter with the zest-infused sugar until well-combined.

Step 4

Grind the almonds, flour, and salt in the food processor until the almonds are completely pulverized.

Step 5

Add half of the almond mixture to the butter, then add the eggs one by one, stopping the machine a few times (if using a stand mixer) to scrape the sides down. Then add the remaining almond mixture, stirring just until incorporated.

Step 6

Scrape the batter into the pan. Level the top of the batter, and bake the cake for 40 minutes, or until a toothpick inserted into the center comes out relatively clean, but a little moist. (The original recipe said to bake the cake for 50-60 minutes, so it may take longer than it took me.)

Step 7

While the cake is baking, make the syrup by heating the 3/4 cup citrus juice and 6 tablespoons of sugar in a nonreactive saucepan until boiling and the sugar is dissolved, then set aside. When the cake comes out of the oven, brush the syrup liberally over the hot cake. Let cool completely in the pan.

Step 8

To candy the oranges, cut the orange into 1/4-inch slices. Put the slices in a nonreactive saucepan, and add enough water to cover them well, and bring to a simmer. Blanche the slices for ten minutes, then drain well.

Step 9

Put the oranges back in the saucepan and add the 2/3 cup sugar and 2/3 cup water and cook the oranges at a simmer for about ten minutes, or until they are tender and translucent.