Whisk ¾ cup (83 g) powdered sugar with unsalted butter, tahini, salt, and vanilla until smooth, then mix in flour until no dry pockets remain.
Chill the dough rolls to maintain shape. Cut each log, re-form pieces by alternating tahini and chocolate colors, and chill again.
After chilling, slice and re-form the dough by brushing with water and adhering pieces together for a visually appealing log.
Use a long, thin knife for clean cuts; if logs crack, let them warm slightly before cutting to avoid brittleness.
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