Popping boba is made by spherification: a fruit juice mixed with sodium alginate is dropped into a cold calcium bath, which instantly forms a thin gel skin around each droplet while the inside stays liquid. That skin is what bursts when you bite it.
The process step by step
1. The juice base. Fruit juice or puree (mango, lychee, strawberry, passionfruit) is sweetened and adjusted for acidity, because very acidic juice stops the gel forming properly.
2. Adding sodium alginate. A small amount of sodium alginate, extracted from brown seaweed, is blended into the juice and left to rest so air bubbles escape.
3. Dropping into the calcium bath. The mixture is dripped into cold water containing calcium lactate or calcium chloride. On contact, the alginate reacts with the calcium and forms a membrane around each drop.
4. Rinsing and storing. The spheres are rinsed to stop the reaction, then held in light syrup so they keep their shape and flavour.
Popping boba vs tapioca pearls
Tapioca pearls are cooked cassava starch: chewy, neutral and served warm. Popping boba is cold, fruity and bursts. Tapioca needs boiling and has a short shelf life once cooked; popping boba comes ready to serve, which is why it is popular at events and for children.
Is popping boba vegan?
Almost always yes. Sodium alginate comes from seaweed and the base is fruit juice, so there is no gelatine or dairy involved. Always check the individual product for added colourings.
We serve both popping boba and freshly cooked tapioca pearls at events. See our bubble tea catering or order trade quantities through our wholesale supply.
People also ask
- What are the bubbles in bubble tea made of?
- Tapioca pearls: cassava starch, water and brown sugar. The name itself comes from the foam on a shaken tea. Read the full answer
- What is popping boba made of?
- Fruit juice sealed in a thin seaweed-derived alginate skin, set with calcium — no tapioca and no gelatin. Read the full answer
- What is crystal boba?
- Translucent agar jelly pearls with a springy bite and roughly a third of the calories of tapioca. Read the full answer
- Crystal boba or tapioca pearls — which should you use?
- Crystal boba is lighter, clearer and holds texture for hours; tapioca gives the classic dense chew of a milk tea. Read the full answer
Need boba supplies in bulk?
We supply tapioca pearls, popping boba, syrups, powders, cups and sealing film on trade terms, with shipping across the UK, Europe and further afield.
