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1
Blend sodium alginate into your chosen liquid using an immersion blender on high speed for 2 minutes until fully dissolved and bubbles subside (rest 15 minutes if foam appears).
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2
Dissolve calcium chloride in 1 l water, stirring until clear; pour into a shallow bowl.
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3
Fill a second bowl with 1 l plain water for rinsing spheres.
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4
Draw sodium alginate liquid into a 10 ml pipette or spherification spoon; hold 2 cm above the calcium chloride bath and release drops slowly.
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5
Allow each sphere to sit in the calcium bath for 45–60 seconds (longer for thicker membrane); gently stir occasionally.
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6
Use a slotted spoon to transfer spheres to the rinse water; agitate gently for 30 seconds to remove excess calcium chloride.
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7
Drain on a clean cloth or consume immediately. Spheres hold for 4 hours refrigerated.