Preheat the oven to 325°F (165°C). Grease and line the bottom of a 10-inch tube pan with parchment paper.

Whisk egg yolks in a medium bowl until lighter in color. Gradually add 1 cup sugar and orange zest; continue whisking until thick and pale, about 7 minutes.

Sift matzo cake meal and potato starch together; set aside.

Beat egg whites in a large glass or metal mixing bowl until foamy. Gradually add remaining ½ cup sugar, continuing to beat until whites form stiff peaks.

Fold matzo mixture into yolk mixture alternately with orange juice. Fold ⅓ of the whites into the batter, then quickly fold in remaining whites until no streaks remain. Spread evenly into the prepared pan.

Bake in the preheated oven, checking after 45 minutes, until a toothpick inserted into the center comes out clean, about 1 hour.