In a mortar with pestle add garlic, spices and chili pepper. Smash everything until a smooth paste.
Add coriander and parsley and smash it again until herbs become a paste.
Slowly add olive oila dn squeeze the 1/2 of the lemon juice.
Taste the chermoula and adjust the seasoning according to your preference. You can add more salt, lemon juice, or spices to suit your taste.
Transfer the chermoula sauce to a jar or airtight container and refrigerate for at least 1 hour before using. This allows the flavors to meld together and develop.