In a small bowl, prepare an ice bath - water and ice cubes.
Bring about 2 cups of water to boil in a small sauce pan.
Add the basil leaves and make sure they are all submerged. Cook for about 10-12 seconds.
Immediately scoop out with a slotted spoon and transfer to the ice bath.
Once they have cooled, remove to paper towels to drain. Gently squeeze the paper towels to remove as much of the liquid as possible.
Pour oil into large metal or glass container add salt and mix with hand blender. Add 1/2 of the basil leaved and process briefly.
Add the remaining leaves and blend until all leaves are pureed.
Add a few fresh basil leaves, blend well. This will brighten the flavor to total freshness.