Measure and add all ingredients except the sesame seeds to the bowl of a good processor.
Pulse several times, then blend on medium-high speed. Pause to scrape the sides of the bowl if needed. Continue mixing until a thick, creamy texture forms.
Transfer to a serving bowl or storage container. Garnish with sesame seeds, or drizzle with additional sesame oil if desired. Serve immediately or store in the refrigerator for up to four days.
Notes
If using frozen edamame, thaw prior to blending in the food processor.