Prep the aromatics: Dice the scallions into small rounds and grate the peeled ginger. Place both into a medium heat-proof bowl, such as a ceramic or oven-safe bowl.
Add seasonings: Add the sesame oil, salt, white pepper, and Sichuan peppercorn powder (if using) to the bowl with the aromatics.
Heat the oil: In a small, heavy-bottomed saucepan, add the avocado oil. Heat it over medium-low heat, uncovered, for about 7–8 minutes, until the oil simmers. To check if the oil is ready, insert a dry chopstick into the oil—if small bubbles form around it, the oil is hot enough.
Activate the sauce: Slowly and carefully pour the hot oil over the scallions and ginger in the bowl. The mixture will sizzle immediately. Stir with a spoon to combine, and let the scallions soften for a few minutes.
Storage: Once the sauce has cooled to room temperature, transfer it to an airtight glass container. Store in the fridge for up to 1 month, but for the freshest flavor, use it within the first 2 weeks.
Notes
How to Use: This versatile sauce can be used as a dipping sauce, finishing oil, or topping for meats, vegetables, tofu, or rice. See Scallion chicken and Scallion oil noodles.
Ensure the saucepan and chopstick are completely dry before adding the oil to prevent splattering.
Always use a heat-proof bowl, like ceramic or oven-safe materials, to avoid accidents.
Heat the oil gently over medium-low heat to avoid scorching the scallions and ginger.