Yuzushu (柚子酒, homemade yuzu liqueur)

Yuzu belongs to the cold months. The skin turns yellow, the perfume sharpens, and one fruit can scent a room before you have done anything clever to it. That is the first secret of yuzushu: choose yuzu at 旬 (shun), at its prime, and don't ask the jar to repair a tired fruit.

This is not a difficult drink to make. It is fruit, sugar, and shochu resting together until the alcohol pulls fragrance from the peel and brightness from the flesh. The rock sugar dissolves slowly, which matters because a quiet extraction gives you a cleaner liqueur than a rush of fine sugar sitting at the bottom like wet sand. Even here, the method has manners.

Leave the peel on. That is the detail that decides the drink. The juice gives tartness, but the peel carries the yuzu's high winter scent, the part you recognize before you taste it. After six weeks, strain it before bitterness begins to crowd the perfume. Pour it small, chilled or over one clean cube of ice, and let it be itself: honmono, unhidden, and very good at making a cold evening behave.