Add the fresh basil leaves to a food processor and pulse until finely chopped.
Add the remaining ingredients and blend until smooth or desired consistency is reached. If your basil pesto is too thick, add more olive oil to smooth it out.
Taste and adjust seasoning, if needed. Extra salt or lemon juice helps balance all the flavors.
Serve immediately or store in the fridge for flavors to really come together.
Notes
Store leftover pesto in an airtight container in the refrigerator for up to 1 week or in the freezer for up to 3 months.