In a pot bring 3 quarts salted water to a rolling boil. Place herb leaves in a strainer and lay in water for about 20 to 30 seconds. Remove from water and lay in large bowl of ice water to stop cooking and retain brilliant color. Remove any stray leaves from boiling water with a slotted spoon and add to leaves in ice water.
Drain herbs and place on paper towels. Wring gently to dry. Place in blender. Add salt, oil and sugar and puree until mixture is very smooth.
Pour oil though a sieve and press on solids. Discard remaining solids.
Chill oil to store up to three days. Allow to come to room temperature before serving.