Remove the stalks from the spinach. Bring the water to the boil with the salt. Once boiling, add the spinach leaves and blanch for 3 minutes, then remove the spinach from the pot and squeeze out as much of the remaining liquid as possible.
Add to a Thermomix jug with the xanthan gum and blend on high speed until smooth. Remove from the blender and chill over an ice bath to preserve the colour.
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