Sweet Orange Rolls

These rolls are filled and topped with a mixture of orange zest, orange juice and confectioners' sugar. They look and taste exactly like sunshine. Ingredients are listed below:

For the Sweet Roll Dough (enough for 2 batches):
2 1/4 teaspoons (7g) active dry yeast
1/2 cup (118ml) warm water (110°F or 43°C)
1/2 cup (118ml) lukewarm milk (scalded and then cooled)
1/3 cup (67g) sugar
1/3 cup (76g) shortening or butter, softened
1 teaspoon salt
1 large egg
3 1/2 cups (500g) all-purpose or "plain" flour

For the citrus filling/topping (enough for 1 batch of rolls):
3 tablespoons softened butter
The grated peel of 1 large naval orange (1 tablespoon)
The juice of 1 large naval orange (2 tablespoons)
1 1/2 cups (170g) confectioners' sugar

Bake 20-25 minutes at 375°F.