Frozen drink science

A frozen concoction maker shaves a set amount of ice for the amount of liquid you add. Whether the result is spoonable, sippable or soupy depends on what’s in that liquid.

Alcohol lowers the freezing point

Ethanol freezes far below water, so the more spirit in the jar, the softer the slush. That’s why a margarita stays smooth while an alcohol-free version of the same recipe can freeze firmer and stall the blade. Fix: add an ounce or so more liquid to mocktails, or use Blend Only longer.

Sugar does the same thing

Dissolved sugar also lowers the freezing point and keeps ice crystals small. Syrups, liqueurs and juice concentrates make smoother drinks; unsweetened juice makes icier ones. If you cut the sugar, expect a coarser texture.

Fruit is ice you can taste

Frozen fruit replaces part of the ice and adds body without dilution. Fruit-heavy recipes are thicker and need a longer blend — that’s why the Fiji, Tahiti and Bali manuals have a Daiquiris (and Smoothies) program, and why our fruit recipes say to Blend Only a few extra seconds.

Fat makes it creamy

Ice cream, cream of coconut and dairy coat ice crystals, so drinks feel creamy rather than icy. They also thicken a lot — use the Slides setting on the Fiji, and soften ice cream first.

Bubbles foam

Carbonation foams up when blended. Add beer, prosecco or soda last, down the side of the jar, and stay under the fill line — or blend without it and top each glass.

The manual’s texture dial

The Bahamas manual gives the rule of thumb: about 12 oz or less of liquid (for 3 drinks) for thicker, 14 oz or more for thinner. The DM1946 manual gives ~9 oz for thicker and ~10.5 oz for thinner on its 3-drink setting. Use the batch calculator to scale.

Dilution

Shaved ice melts fast. Chill glasses, keep juices cold and serve right away. Wine and beer drinks melt fastest because they have the least alcohol.