Heat the gel mixture

• Combine the lemon juice, caster sugar and agar agar in a small saucepan.
• Bring to a boil and cook for 1-2 minutes while whisking constantly to prevent burning.

Set the gel

• Pour the gel into a plastic container.
• Refrigerate until fully set.

Blend until smooth

• Transfer the set gel to a tall narrow plastic pitcher.
• Blend with an immersion blender until smooth and clump-free.

Fill and decorate

• Transfer the gel to a piping bag.
• Fill or decorate your cakes.