Tahini Swirl Brownies

The duo of dark chocolate and cocoa powder gave these brownies depth, and the vanilla enhanced the flavor of both of them. The combination of tahini and sugar replicates the sweet sesame flavor of halvah candy but was easier to work with—and to find. Swirling the reserved tahini batter into the chocolate created a visual and textural contrast and let the tahini flavor shine. The best way to marble the brownies was to run the tip of a paring knife through the dollops of batter.