Buttery, nutty shortbread sandwich cookies with a jewel of raspberry preserves peeking through a delicate cut-out center.
Chef's Note: These delicate sandwich cookies take their name and style from the classic nut-based shortbread pastry, and the ground toasted walnuts are what give the dough its subtle nutty depth alongside a tender, almost sandy crumb. Keeping the dough properly chilled before cutting is non-negotiable here — clean, precise edges depend on it, and dough that's too soft will smear rather than cut cleanly under the cookie cutter.
Feel free to swap the raspberry preserves for apricot, blackberry, or any thick jam you have on hand — just make sure it isn't too runny, or it will seep out from between the cookies. For the crispest texture, store the unfilled cookie halves in an airtight container and assemble the sandwiches closer to serving time, since the preserves will gradually soften the cookies the longer they sit together. Note that the hour of active time above doesn't include the 2-hour dough chill, so plan on roughly 3 hours from start to finished cookie.
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