Put all ingredients in a strong mixer / chopper (a hand blender is often overwhelmed). Chop everything up well. Pour into screw-top jars and cover with a layer of olive oil.
The pesto will keep in the refrigerator for about 3 months (always cover well with olive oil and make sure that the edge of the glasses stays clean). Even if with us it`s usually all before then.
Danger:
The pesto is very salty !! If you don`t like that much salt, you should use unsalted cashew nuts. If it is too dry, simply add a little more oil until the desired consistency is achieved.