Red Shiso Juice (赤紫蘇ジュース, Akajiso Jūsu)

Red shiso arrives with the rainy season, bundled in markets for ume work and gone before the careless cook has made up their mind. This is 旬 (shun), the short moment when the leaves are fragrant, tender, and full of color. Wait until late summer and the stalks turn tough, the scent goes thin, and no amount of sugar will make it honest.

The drink looks like a little kitchen magic. It isn't. Simmer the leaves just long enough for the color and perfume to move into the water, then strain them away before their grassy edge takes over. Add lemon and a little rice vinegar off the heat, and the dark liquid brightens at once. Red shiso's pigment loves acid, which is why the color wakes up so cleanly.

The one detail that decides it is restraint. Don't boil the leaves into submission, don't sweeten until the shiso disappears, and don't pretend tired leaves can be rescued in the pot. This is honmono summer preserving, simple and plain: leaf, water, sugar, acid, cold. Serve it diluted over ice after a meal, or carry a bottle outside when the heat has made everyone quiet.