A slushy cup does not need ice, a blender or a machine. It needs a few hours in the freezer and about a minute of squeezing. Here is the whole method, start to finish, plus the handful of mistakes that stop it working.
What comes in the box
- The cup, 300 ml (about 10 oz)
- A lid
- A spoon and a straw
- An easy how-to manual
There is nothing to assemble, no blades and no motor. The cup is food-grade and BPA-free, and it is soft enough that kids can squeeze it themselves.
Step 1: Freeze the empty cup
Put the cup in the freezer empty, with the lid off, for four to six hours. Overnight is easiest, and it is what most people end up doing.
The cooling layer between the two walls of the cup has to be frozen solid, not just cold. This is the single most common reason a slushy cup does not work. If you are unsure, freeze it for longer. You cannot over-freeze it.
Step 2: Pick a drink that will actually slush
Soda, fruit juice, lemonade, iced coffee, smoothies and even milkshakes all work. Smooth juices without pulp work best.
Sugar is what gives you soft slush instead of one solid block, so diet and zero-sugar drinks behave differently. Skip alcohol entirely. It never fully freezes, so it stays liquid and moves around inside, and over time that can damage the lining.
Step 3: Fill it about three quarters full
Pour your drink in to about three quarters and leave room at the top. Liquid expands as it freezes, and a cup filled to the brim has nowhere to put that expansion, so it pushes out around the lid and the straw hole.
If you are not sure, pour in less than you think you need. You can always top it up after the first squeeze.
Step 4: Lid on, straw in
Put the lid on slowly. It should sit flat with no gap anywhere around the rim. If one side lifts, something is caught in the thread, and a drop of dried juice is enough to break the seal. Rinse the rim and the inside of the lid, dry both, and try again.
Put the straw in before you start squeezing. When you squeeze, the slush has to go somewhere, and an open straw hole is the easiest way out.
Step 5: Squeeze for about a minute
Squeeze the sides of the cup with both hands. Short presses work better than one long hard push, and squeezing slowly gives you a smoother result.
You will feel it thicken as you go. Most drinks are ready in about a minute. If it is still sloshy after that, the cup was not frozen for long enough.
Step 6: Eat it
Use the spoon for the thick slush at the top and the straw once it loosens up. Eat it fairly soon, because a slush made in your hands does not stay frozen for long at room temperature.
Washing it and putting it away
Hand wash only, in cool or warm water. Take the pieces apart, rinse, dry them, and put the cup straight back in the freezer so it is ready for next time.
Never put it in the dishwasher and never use hot water. Dishwashers run hot enough to warp the lid and the seal, and once the seal is out of shape the lid will not sit flat again. Hot water damages the cooling layer too.
Five things that stop it working
- Not frozen long enough. The most common by a distance. Four to six hours at minimum, overnight is safer.
- Filled too high. Three quarters, not to the brim.
- The lid is not seated flat. Something caught in the thread breaks the seal.
- Squeezing with the straw hole open. That is pressure escaping, not a leak.
- Washed in hot water or a dishwasher. This one is permanent.
One more that catches people out. A damp towel under a frozen cup is usually condensation, not a leak. A frozen cup pulls moisture out of the air and it runs down the sides. Check whether the level inside has actually dropped before you worry about it.
