Add the sesame seeds and toast for 3–5 minutes, stirring constantly, until fragrant and just lightly golden; do not let them brown deeply.
3
Transfer to a plate and cool completely.
4
Add the cooled seeds to a food processor and blend, stopping to scrape down the sides as needed, until they turn into a smooth, pourable paste; this may take 5–10 minutes.
5
If the paste is too thick, blend in oil a little at a time.