Begin by bringing two large pots of water to a boil.
In one pot, salt the water heavily, and cook the pasta according to box instructions. Drain pasta and reserve pasta water.
In the other pot, add 1 teaspoon salt and peeled, whole or sliced in half garlic cloves once simmering.
Prepare an ice bath by filling a bowl with ice cubes and water.
Once the second pot of water is rapidly boiling, add your fresh basil to the pot and cook for about 30 seconds, until bright green.
Strain or use a spider to remove the basil and garlic, then immediately place into ice bath.
Let the ingredients sit in the ice bath until cool to the touch. Then remove and squeeze out as mush excess water as possible.
In a blender, add the garlic, basil, and olive oil. Blend until smooth.
Add up to ¼ cup of pasta water as needed while blending, adding 1 tablespoon at a time.
In a mixing bowl, add the cooked pasta and the basil oil sauce.
Mix to combine and season with salt as needed.