Best done in a mortar and pestle! (I use a Kota Japan) Be advised it can be an arm workout and takes some time. If you’re feeling lazy blitz it up in a food processor!
Bring a medium pot of salted water to a boil. Blanch kale for 1-1.5 minutes and cool in ice water. Remove excess water from kale in a salad spinner, rough chop.
In a mortar and pestle add garlic clove and generous pinch salt, work into a paste.
Add walnuts and crush into small bits. Begin adding kale, handfuls at a time and grind into a paste.
Add cheese and slowly drizzle in oil until emulsified.