This orange chocolate lava cake is a citrusy twist on the classic recipe. The cake has a crispy exterior and a molten chocolate center that is infused with the bright flavor of orange. The recipe is similar to the classic lava cake, but with the addition of orange zest. The orange zest is added to the cake batter before baking, creating a delicious surprise when you cut into it. Serve it warm with a dusting of powdered sugar and a few fresh orange slices on top.