Preheat your oven to 325°F (165°C). Line a large baking sheet with parchment paper.
In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
In a large bowl, beat the sugar and eggs until pale and thick, about 3 minutes. You can use a stand mixer fitted with the whisk attachment or a hand mixer.
Gently warm the honey so it becomes more fluid, then add it to the egg mixture along with the vanilla extract and orange zest. Beat until well combined.
Gradually add the dry ingredients to the wet ingredients, mixing until just incorporated. Fold in the chopped almonds with a spatula.
Transfer the dough to the prepared baking sheet and shape into a log approximately 12 inches long and 3 inches wide, using the melted butter to smooth the surface.
Bake for 25-30 minutes, or until the log is golden and firm to the touch. Remove from the oven and let cool for 10 minutes.
Reduce the oven temperature to 300°F (150°C). Transfer the log to a cutting board and, using a serrated knife, cut diagonally into 1/2-inch thick slices.
Place the slices cut-side down on the baking sheet and return to the oven for 10-15 minutes, or until they are crisp and golden.
Transfer the biscotti to a wire rack and let them cool completely before serving.