Preheat the oven to 325°F. Spread sesame seeds out on two rimmed baking sheets and place in the oven to toast for 15-20, stirring a couple times during cooking to prevent burning. Remove from the oven and let cool.
Place sesame seeds in a food processor and blend on high until smooth, adding the oil as needed. Add salt and blend.
Store tahini in an airtight glass jar in the fridge for up to 2 months.