倒入面粉,盐和胡椒在食品processor. Process until just blended. Add the butter pieces and pulse until the dough resembles coarse crumbs. Stir the yolk and mustard together with a fork and drizzle over the flour mixture. Pulse until the dough begins to form moist crumbs that are just beginning to clump together. Add the sesame seeds and pulse very briefly (just two or three quick pulses will do the trick; any more and the seeds will break down too much).
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