Agar Clarification
A loose agar gel traps pulp and solids from juices and mixes; breaking or thawing it releases a clean, dairy-free liquid.
The principle
Agar forms a network that holds particles. When the gel is very weak, around 0.2% agar by total liquid weight, the network releases clear liquid easily and keeps the solids.
It works very well with citrus, grapefruit, watermelon or cucumber juice. It adds no dairy, unlike milk punch.
Quick agar method
Hydrate the agar in a portion of the liquid (or water), bring it to a boil to dissolve, then quickly whisk it into the rest of the cold juice. Let it set in an ice bath, break the gel with a whisk and strain through cloth, pressing gently.
It takes under an hour and gives a very clear liquid, although some volume stays in the gel.
Freeze-thaw method
Let the gel set firmly, freeze it solid, then thaw it slowly in the fridge over cloth. As it thaws, clear liquid drips out and the gel keeps the solids.
It's slow (one to several days) but usually gives the clearest result. Use it when you can plan ahead.
Equipment
- Precision scale (0.1 g or better)
- Agar powder
- Small pot and whisk
- Ice bath
- Cheesecloth or filter bag
Key variables
- Agar concentration
- Start with 0.2% of total weight. More agar makes a firm gel that holds liquid; less won't trap solids well.
- Temperature
- Agar must boil to dissolve and sets as it cools. Mix quickly so it doesn't gel too early.
- Straining pressure
- Gentle pressure. Squeezing hard pushes particles through and clouds the result.
Process
- 1
Weigh the total liquid and calculate about 0.2% agar (2 g per kilo).
- 2
Disperse the agar in a portion of the liquid or in water and boil, whisking, until dissolved.
- 3
Quickly whisk in the rest of the cold liquid so no lumps form.
- 4
Let it set in an ice bath without moving it.
- 5
Quick method: break the gel and strain through cloth with gentle pressure. Slow method: freeze, then thaw in the fridge over cloth.
- 6
Taste, adjust acid or sugar if needed, bottle and label.
Storage
Refrigerated, in a clean sealed bottle, labeled with the date.
Shelf life
Treat it like fresh juice: ideally the same or next day; citrus flavor fades quickly. Label and date it; when in doubt, discard.
Use it in
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Sources
- Liquid Intelligence by Dave Arnold
Updated October 20, 2026