Spray a 10x14 baking sheet with nonstick baking spray. Line it with parchment paper and then spray the top.
Add the egg yolks to a mixing bowl and mix for 3 minutes. Add the sugar and zest and mix for another 3 minutes.
Add the orange juice and mix to combine.
Add the flour and mix until it's just incorporated.
Add the egg whites to a separate bowl. Mix until it forms stiff peaks and holds its shape.
Gently fold the egg whites into the cake batter.
Spread the cake batter onto the preparing baking sheet.
Allow the cake to bake for 10-15 minutes or until a toothpick comes out clean.
Sprinkle powdered sugar over the top of the cake. Place a towel on top of it and slowly roll up the cake. Place the rolled cake onto a cooling rack.
Create a double boiler. Bring a pot of water to a simmer. Make sure that the water is only filled about halfway. You don't want it to ever touch the bottle of the bowl.
Add the egg whites and sugar to a bowl and whisk for 4 minutes.
Place the bowl over the simmering pot of water. Continue to whisk for 5-8 minutes until it is foamy and the temperature is 160 degrees.
Pour the foamy mixture into a mixing bowl and mix on high for 10 minutes or until stiff peaks form an it holds its shape.
Carefully unroll the cake. Remove the towel and parchment paper.
Pipe a 1" border all around the cake with the Swiss meringue. Spread the Swiss meringue inside the boarder.