This is an easy marinade to throw together. You can marinate any fish you'd like with this marinade, but I prefer whitefish. You only need to marinate your fish for a short amount of time - an hour or two is plenty.
In food processor or blender combine cilantro, garlic, vinegar, lemon juice, paprika, cumin, crushed red pepper, olive oil, salt, and cayenne to a fine paste. Adjust the consistency by adding more olive oil; the marinade should be fairly thick.