Put the sesame seeds into a dry, wide skillet set over medium-low heat and toast, stirring constantly until the seeds become fragrant with a very light color; about 3-4 minutes. Do NOT brown.
Immediately remove the seeds to a plate or flat pan to cool; leaving them in the skillet may allow them to burn.
To Make the Tahini
Put the sesame seeds into a blender or the bowl of a food processor. Process until the seeds form a crumbly paste that sort of stick together, about 1 minute
Add 2 tablespoons of the olive oil and blend or process for 2 to 3 minutes more, stopping to scrape the bottom and sides of your appliance a couple of times until the mixture is smooth.
Add additional oil if necessary until the Tahini is just barely pourable. Season to taste with salt and pepper and process again until thoroughly combined. Chill until ready to use.
Notes
Tahini can be kept in the fridge for up to one month; if when using it appears separated, just stir thoroughly before use. Great on warm veggies and in salad dressings too!