Preheat the oven to 350F. In a bowl, mix the almond flour, cocoa powder, melted butter, and maple syrup until a dark, crumbly dough forms.
Press the crust mixture firmly into the bottom and up the sides of a 9-inch tart pan. Bake for 10 minutes, then remove and let cool completely.
Finely chop the high quality dark chocolate and place it into a heat-safe glass bowl.
In a small saucepan, bring the heavy cream just to a gentle simmer, then immediately pour it over the chopped chocolate. Let it sit undisturbed for 5 minutes.
Gently whisk the cream and chocolate together starting from the center until a glossy, dark ganache forms.
Stir the fresh orange zest, vanilla extract, and sea salt into the chocolate ganache.
Pour the rich filling into the cooled chocolate almond crust. Chill in the refrigerator for at least 4 hours until fully set before serving.