Bring a medium pot of water to the boil. Blanch the de-stemmed kale for about 10-15 seconds until soft but still bright green. This sets the colour and helps mellow the strong kale flavour. Remove from the water, strain and immediately run the cold water to stop the kale cooking further. Wring out and add to the blender.
Add the remaining ingredients except for the lemon juice and seasoning. Blend well, using the water if you need it. If you have a Nutribullet, I recommend putting something heavy in first, like the beans. This will help press everything down into the blade when you invert the blender cup.
Blend until smooth, then add lemon juice and seasoning to taste. Spoon over pasta, vegetables, or anything that needs a delicious sauce. If you're making pasta, this pesto is enough for 400g worth of raw pasta with some leftover. Keep the FODMAP limits in mind when serving if need be, and read the notes carefully. Leftover pesto keeps well for a number of days but can also be frozen and defrosted.