Orange angel food cake recipe with passion fruit syrup

Ingredients for the cake:
1 cup (approx. 120 g) angel flour (fine flour)
1 1/2 cups (about 300 g) sugar, divided
12 egg whites, at room temperature
1 tablespoon freshly squeezed orange juice
1 teaspoon orange peel, grated
1/4 teaspoon salt
1 teaspoon Creme of Tartar (cream of tartar) or 1 tablespoon lemon juice
Ingredients for the passion fruit syrup:
1 cup (approx. 240 ml) fresh passion fruit juice
1/2 cup (approx. 100 g) sugar
Juice of half a lemon
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