Toast the cashew nuts in a dry non-stick pan until starting to turn golden brown.
Tip out onto a plate and leave to cool.
Once cool, tip the cashews into a small blender with the Thai basil, olive oil, lemon juice and soy sauce.
Blend until desired consistency. I like my pesto quite chunky.
Check and add more lemon juice or soy sauce as required.
Use straight away, or cover well and store in the fridge for up to 2-3 days.
Notes
Thai Basil - This pungent, slightly spicy aniseedy basil is used extensively over Southeast Asia. if you can't get Thai Basil, substitute Italian basil and add a couple of mint leaves and sprig of fresh dill.Cashew nuts - you can substitute peanuts for a Thai flavour. If you want a nut free Thai pesto then use sunflower seeds or pumpkin seeds.Substitute the lemon juice with a little rice vine vinegar.Keep in the fridge, covered, for up to 2-3 days.To freeze the pesto: spoon into ice cube trays and take out as needed.