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Whisk together flour and salt in a bowl. Beat butter and tahini with an electric mixer on medium speed until creamy, 1 to 2 minutes. Add sugar and beat until light and fluffy, 1 to 2 minutes. Reduce mixer speed to low and gradually beat in flour mixture just until combined. Beat cocoa powder into remaining dough just until combined. Line a rimmed baking sheet with parchment paper. Stack chocolate dough on top of plain dough.
Cut circle in half and stack one half onto the other. Using your hands, gently fold and knead stack into a marbled ball. Line two baking sheets with parchment paper. Bake, in batches, until edges are lightly browned, 12 to 14 minutes. Transfer to wire racks to cool. This content is created and maintained by a third party, and imported onto this page to help users provide their email addresses.