In a food processor or blender, combine the chopped cilantro, cashews, garlic cloves, and kosher salt.
Pulse a few times until the ingredients are coarsely chopped and mixed.
Add the lemon juice to the mixture.
While the food processor or blender is running, slowly pour in the olive oil.
Blend until the mixture becomes smooth and creamy. Add more olive oil if you need it to achieve your desired consistency.
Taste the pesto and adjust the seasoning if necessary.
If the pesto is too thick, add more olive oil or lemon juice and blend again.
Transfer the cilantro pesto to a jar or airtight container and refrigerate. It can be stored in the refrigerator for up to a week.