Whirl the herbs, garlic, nuts and Parmesan in a food processor until well mixed. Then add the olive oil in a slow, steady stream until a smooth paste is formed.
This will keep in a tightly closed jar in the refrigerator for a week. To freeze, put two tablespoons (one serving) in a muffin cup or on a cookie sheet and freeze until solid and then put in plastic bag.
Serve with fish or pasta.