How to Make Sponge Ice
Create porous, chewable sponge ice cubes at home by whipping bloomed gelatin into an airy foam before freezing. Perfect for cold drinks and aesthetic desserts.
This guide shows how to make sponge ice in 30 mins active + 4 hours freezing. Start with bloom the gelatin base; follow the safety notes and step checkpoints below.
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🧰 Required Tools & Equipment
- ✓ Electric hand mixer with whisk attachment
- ✓ Heatproof glass or stainless steel mixing bowl
- ✓ Silicone ice cube mold or shallow baking dish
- ✓ Rubber spatula
- ✓ Measuring cups and spoons
- ✓ Kettle or small saucepan
📦 Materials & Supplies
- ✓ 20g unflavored gelatin powder (approx. 2.5 packets)
- ✓ 60ml cold drinking water (for blooming)
- ✓ 120ml boiling water
- ✓ 40g granulated sugar or clear flavored syrup
- ✓ Optional food coloring or fruit extract
⚠️ Safety Checkpoints & Warnings
- • Keep electric mixer cords completely clear of boiling water and wet surfaces.
- • Allow the dissolved gelatin mixture to cool slightly (under 60°C/140°F) before high-speed whipping to avoid hot splashes.
- • Ensure silicone molds are food-grade and placed on a sturdy tray before filling to prevent spills.
📋 Step-by-Step Guide (6 Steps)
Bloom the Gelatin Base
Pour 60ml of cold water into your heatproof mixing bowl and sprinkle the gelatin powder evenly over the surface. Let the mixture sit undisturbed for 5 to 7 minutes to fully hydrate. The powder will absorb all liquid and turn into a thick, wrinkled gel mass.
- • All dry gelatin grains are swollen with no remaining powdery white spots
- • Gel surface looks translucent and firm to a light touch
- • Dumping powder in a single clump, which leaves dry pockets in the center
Dissolve and Sweeten with Hot Water
Pour 120ml of freshly boiled water directly over the bloomed gelatin mass. Add the sugar and stir steadily with a spatula or spoon for 1 to 2 minutes until every grain of sugar and gelatin is completely dissolved into a clear, golden syrup. Add a drop of food coloring now if desired.
- • Liquid is completely clear without suspended gelatin chunks
- • No gritty sugar crystals visible at the bottom of the bowl
- • Using lukewarm water, which fails to melt gelatin crystals completely
Whip into a Dense Sponge Foam
Submerge the electric hand mixer beaters into the warm liquid and start on low speed to avoid splattering. Gradually increase to the highest speed and whip continuously for 6 to 10 minutes. The mixture will expand significantly, turning from a flat syrup into an opaque, glossy, meringue-like foam that holds soft peaks.
- • Volume increases 3 to 4 times original size
- • Mixture turns snowy white and leaves distinct ribbon trails when beaters lift
- • Stopping too early while the mixture is still runny and bubbly rather than thick and creamy
Pipe or Spread Foam into Molds
Work quickly before the gelatin foam begins to set at room temperature. Use a rubber spatula to scoop the fluffy white foam into clean silicone ice molds, pressing lightly to fill corners and eliminate large air voids. Smooth the tops flush with the edge of the mold using the flat side of the spatula.
- • Mold cavities are evenly packed with no large hollows
- • Top surface is level with the mold dividers
- • Waiting too long after whipping, which causes the foam to set into a spongy clump before molding
Freeze to Solidify Cellular Structure
Carefully transfer the loaded mold on its tray into the coldest section of your freezer. Freeze undisturbed for at least 4 hours, or ideally overnight, until the water locked inside the aerated gelatin matrix completely freezes into rigid micro-crystals.
- • Cubes are rigid, frosted, and completely solid to the touch
- • Ice does not deform when gently pressed
- • Unmolding prematurely while the core is still squishy or semi-liquid
Unmold and Serve
Gently press the bottom of each silicone cavity upward to pop out the sponge ice cubes. Drop them immediately into iced tea, soda, or cold coffee; the sponge-like cellular structure absorbs the liquid while floating lightly and providing a uniquely soft, chewable icy texture.
- • Clean release from silicone without tearing
- • Opaque, porous, foam-like appearance in the glass
- • Letting unmolded sponge ice sit at warm room temperature without liquid, which makes it soften into marshmallow gelatin
Credit: inspired by an original tutorial by Ms Shi and Mr He — watch the original on YouTube.
Don’t have everything?
- No Electric hand mixer? Stand mixer fitted with a whisk attachment
- No Silicone ice mold? Mini muffin tin lined with plastic wrap or silicone cupcake liners
- No Granulated sugar? Flavored drink syrup, honey, or fruit cordial