Preheat the oven to 350 F. Lightly grease an 8 inch round cake pan. Using a pencil, trace a circle the size of the pan on parchment paper and cut it out. Place it at the bottom of the greased pan and press it down, so it fits well all around. Place the oven rack in a medium-low position.

Combine almond meal and baking powder in a bowl. Set aside.

Combine eggs, sugar, honey, vanilla, and salt in a large bowl. Beat using an electric mixer for 3-4 minutes. Add orange zest and almond meal/baking powder mixture and mix until just combined

Fold in chopped pistachios and pour batter into a greased pan. Bake at 350F for 25-30 minutes or until a knife inserted in the middle comes out clean. Let the cake cool. Place a large place over the pan and turn it over. The cake should release easily. Carefully feel off the parchment paper.