Blanch the herbs in boiling water for 30 seconds, then immediately refresh in a bowl of iced water. Blanching destroys the enzyme that causes the herbs to oxidise and turn brown, ensuring the herb oil has a bright green colour
Squeeze the herbs to get rid of any excess moisture, then spread the herbs out to dry on a clean cloth, patting them as dry as you can
Place the herbs and oil into a high-powered blender and blend for 10 minutes, or until the outside of the blender feels hot, or an instant read thermometer reads 60°C
Transfer the herb oil to a small bowl, then place the small bowl in a larger bowl of iced water, to chill it down quickly. This will keep the herb oil a nice bright green colour
Transfer the oil into a coffee filter suspended over a container and leave to strain overnight
Discard the solids and store the herb oil in the fridge for up to 2 weeks
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