Semolina Pudding with Fresh Berries

1 1/2 tablespoons finely grated orange zest (from 1/2 medium orange)

1 teaspoon finely grated lemon zest (from 1/2 medium lemon)

1 vanilla bean, split lengthwise

1 cup semolina flour (pasta flour), plus additional for dusting baking dish

5 large egg yolks, room temperature

1/2 cup (1 stick) unsalted butter , cut into 1-inch cubes

5 large egg whites, room temperature

1 cup sugar

4 cups (from about 1 1/2 to 2 pounds, picked over) strawberries, hulled and thinly sliced lengthwise