Preheat oven to 350 degrees. Grease your tart pan with coconut oil. I used a 10” rectangular tart pan, but you can use a 8-9" tart pan.
In a medium saucepan, add coconut and walnut oil and 3/4 cup semisweet chocolate. Once chocolate begins to melt, stir until smooth and creamy.
Remove from the pan and stir in sugar, vanilla, and whisk in one egg at a time. In a separate bowl, whisk together cocoa powder, salt, almond meal and tapioca flour. Slowly whisk in dry mixture to brownie batter and beat well until smooth.
Stir in chocolate chunks and walnuts. then scrape batter into tart pan. Sprinkle with sea salt and bake for 30 minutes.
Let cool before topping with ganache. {you can speed this up by placing in refrigerator}