01 - Bring a small saucepan of water to a rolling boil and prepare a separate bowl filled with ice water.
02 - Submerge the fresh mint leaves in the boiling water for 10 seconds, then immediately transfer them to the ice water to halt cooking. Drain thoroughly and pat dry with paper towels.
03 - Combine the blanched mint leaves and neutral oil in a blender. Process on high speed for 1 to 2 minutes until the mixture is vibrantly green and the leaves are finely pureed.
04 - Pass the mixture through a fine-mesh sieve or cheesecloth into a clean container, pressing firmly to extract as much oil as possible.
05 - Optionally add a pinch of salt to taste. Transfer the oil to a sealed bottle or jar and refrigerate for up to one week.