Green pesto sauce

1. Combine basil, garlic, salt, and pine nuts in food processor or blender.
2. When evenly blended, with motor still running, add olive oil in slow, steady stream.
3. Turn motor off. Scrape bowl to blend to smooth consistency.
4. Add cheese and softened butter.
5. Process briefly to combine.
6. genuine pesto is always made with fresh basil.
7. If unavailable, you may make a substitute sauce using one cup fresh spinach leaves, ½ cup coarsely chopped italian parsley, and 2 tbsp dried basil leaves.