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1
Heat the oven to 325 degrees F and arrange a rack in the middle.
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2
Mix 1 cup of the sugar with the orange zest in a small bowl until evenly combined; set aside.
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3
Sift the cake flour through a fine mesh strainer 3 times onto a piece of parchment paper or into a large bowl.
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4
Then sift again with the remaining 1/2 cup sugar; set aside.
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5
Place the egg whites in the bowl of a stand mixer fitted with a whisk attachment.
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6
(Be sure the bowl and whisk have been thoroughly cleaned.)
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7
Beat on high until just frothy, about 1 minute.
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8
Add the cream of tartar, orange juice, and salt and beat until the whites just begin to form soft, droopy peaks, about 2 minutes.
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9
Add the sugar-zest mixture 2 tablespoons at a time, letting it mix in before adding more, then beat until the whites are glossy and the peaks are droopy but hold onto a spatula, about 2 to 3 minutes more.
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10
Remove the bowl from the mixer and sift a quarter of the cake flour mixture over the whites.
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11
Gently fold the dry ingredients into the whites with a rubber spatula.
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12
Continue to sift and fold in the remaining cake flour mixture, a quarter at a time, until all of it has been added.
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13
Spoon the batter into a clean, dry 10-inch tube pan with a removable bottom.
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14
Tap the pan twice on the counter to burst any large air bubbles in the batter.
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15
Transfer to the oven and bake until the cake is springy to the touch and a wooden skewer inserted into the center comes out clean, about 35 to 40 minutes.
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16
Invert the pan over the neck of a bottle (the cake should be hanging upside downthis keeps it from collapsing/deflating) until completely cooled, about 1 1/2 hours.
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17
In a large bowl, combine the strawberries, orange juice, and sugar.
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18
Place in the refrigerator and let sit, stirring occasionally, until the sugar has dissolved and the strawberries have let off some juice, at least 15 minutes or up to 1 hour.
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19
Cut around the perimeter of the pan with a knife, remove the base, and cut around the tube and the base to release the cake completely.
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20
Slice with a serrated knife and serve with the soaked strawberries and their juices.