Set oven to 350°F. Line a 6x6 baking dish with parchment. Set aside.
In the bowl of a stand mixer with the paddle attachment combine first amount of tahini, maple syrup, eggs, first amount of confectioners sugar, and vanilla. Mix until well blended, mixture will become thick as it comes together.
Add almond flour, baking soda, and salt. Mix until fully incorporated, mixture will be very thick. Pour into prepared pan.
In a new bowl combine second amount of tahini, confectioners sugar, cardamom, and 1/2 teaspoon of water. Mix well until mixture starts to seize up and drizzle over brownie batter. Use a knife to swirl into batter.
Bake until just set, about 18-20 minutes. Remove from oven and cool completely or hold warm for service. Serve as desired.