How to Make Clear Ice at Home
Follow this step-by-step guide. You don’t need any expensive equipment—the technique is simple, and you probably already have everything you need. Imagine a Negroni with a large, crystal-clear ice cube, or a Tom Collins with a long, transparent ice spear low in oxygen. The wow factor it creates is huge and makes the effort worthwhile. Plus, your drink stays colder for longer and doesn’t dilute as quickly, which truly enhances the flavor experience.
Ice is one of the most important elements in your home bar – or in any bar, for that matter. What you’re really after is the chill and the dilution. Even though ice has only one ingredient – water – it comes in many shapes and forms. You might have used crushed ice for a Mojito, or regular cubes for your gin & tonic. Either way, there are several reasons to vary your ice depending on the drink you’re making. Take the Mojito again as an example: technically you can make it with any type of ice, but crushed ice is preferred because it helps ingredients like mint spread throughout the glass and stay in place. If you use large cubes instead, the mint tends to sink to the bottom and the visual impression isn’t nearly as appealing.
The purpose of this guide is to teach you how to make clear ice cubes, in any shape you like, with perfect results.
What you need to make clear ice at home:
- Water
- A freezer
- A cooler (without a lid)
- A bread knife
- A cutting board
- A hammer
How does clear ice actually form?
Water, the only ingredient in ice, naturally contains oxygen and impurities. When frozen, these create that cloudy, white center you often see in ice cubes. The trick with this technique is to freeze the water in a single direction, forcing all the “cloudiness” down to the bottom of the block. That’s why we use a cooler without a lid: the insulated sides and bottom ensure the water freezes from the top down. As a result, all the cloudy parts get trapped at the bottom. At that point, it’s time to harvest the ice, saw it into your preferred shape, and it’s ready to use in your highball, cocktail, or whatever you’re mixing at home.
Step-by-step:
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Make sure your cooler has no lid, but insulated sides and bottom.
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Fill it with water and place it in the freezer.
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Wait until the block is fully frozen (time varies depending on cooler size and freezer strength).
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Take the cooler out and let it sit for about 30 minutes – this is called tempering the ice block.
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Turn out the block onto a cutting board and cut away the cloudy part.
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Score the block into the size you want your cubes, then tap the knife with the hammer to split clean cuts.
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Your ice is ready! For freezer storage, avoid stacking pieces too close together, or they may freeze together.
Do you need to boil the water?
If you already have clean water (like tap water), there’s no benefit to boiling it. Some claim that putting hot water in the freezer makes it freeze slower, which is supposed to help. But in reality, what happens is everything else in your freezer starts to thaw, causing frost and icicles everywhere – trust me, I’ve tried. So boiling clean water is completely unnecessary if your goal is large, clear ice cubes.
How long does the ice last?
Most modern freezers have an auto-defrost function, which affects ice by slowly shrinking it. Within just a few weeks, the cubes can change shape completely. To extend shelf life, store your ice in zip-lock bags. If you do that, it should last for several months.
