For the cake: Preheat the oven to 350 degrees F. Line a straight-sided baking sheet with parchment.
In a food processor, combine the almond meal, powdered sugar, cocoa powder and salt. Process for 30 seconds to make a very fine mixture. Set aside.
Using a hand-held mixer fitted with a whisk attachment, beat the egg whites on medium speed until beginning to stiffen, about 1 1/2 minutes. Add the cream of tartar, and continue beating, slowly adding in the sugar. Beat on medium speed until glossy and stiff peaks form, an additional 1 1/2 minutes--be careful not overwhip. In 3 additions, fold the dry ingredients into the egg white mixture, just until combined and no streaks remain.
Divide the batter evenly into 2 rounds on the prepared baking sheet. Bake until dry on top and slightly puffed, 25 to 30 minutes. Remove from the oven and cool completely on the baking sheet.
For the ganache: Meanwhile, heat the heavy cream, vanilla and salt in a small saucepan over medium heat until small bubbles form around the edges. Place the chopped chocolate in a medium bowl and pour the cream over the chocolate. Let sit for 3 minutes, then whisk until smooth. Place a piece of plastic wrap directly on top of the chocolate and refrigerate until firm but spreadable, about 1 hour.
Spread the ganache on the flat side of each cake layer. Line raspberries in circles on top of the ganache. Top with the remaining cake. Wrap with plastic wrap and let sit at room temperature for about 2 hours. Slice and serve with a dollop of unsweetened whipped cream.