Perfect Clear Ice Cubes

A conventional tray freezes from many directions at once. As water turns to ice, dissolved air and minerals are pushed toward the center, where they become the familiar cloudy patch.

Directional freezing gives that cloudiness one route to travel. Insulate the sides and bottom of the water so it freezes from the top down, then keep the clearer upper portion and trim away the cloudy base.

A small insulated cooler without its lid is the practical home setup. Fill it with clean water, place it on a level freezer shelf, and let it freeze until there is a solid clear block above a still-liquid or cloudy lower layer. The exact timing varies with the cooler and freezer, so check it rather than relying on one universal number.

No cooler? A purpose-made directional-freezing mold is convenient, and a large silicone mold will still make handsome ice even if it is not perfectly clear. The important thing is choosing the effort that suits the occasion.

Let the block temper briefly on a towel so the surface is less brittle. Work on a stable cutting board, keep hands clear of the blade, and use a clean ice pick or serrated knife only with controlled, gentle taps. If cutting ice feels uncomfortable, use the block whole in a punch bowl or choose a mold instead.

Store finished cubes in a sealed freezer-safe container or bag. Keep them away from strong-smelling foods, and let them sit for a minute before serving if they look frosted on the outside.

Cloudy all the way through usually means the water froze too quickly or from too many directions; use more insulation or a smaller amount of water. Cracked cubes often mean the block was cut straight from the freezer; give it a short temper first.

A clear cube does not make a warm drink better. Stir or shake with regular ice first, then pour over one large clear cube for the final serve.