Transfer the sesame seeds to a baking pan and bake for 5-10 minutes depending on the intensity you like. Stir the sesame seed one time during baking. Don't bake for too long because they may become bitter.
Take the pan off the oven and let it cool for 5 minutes. Transfer the sesame seeds to the bowl of your food processor and process for 30-50 minutes depending on the power of your machine. If you notice your machine having difficulty to process the sesame, add the oil.
When the tahini has the smoothness level you like, stop and transfer it to jar. Store in a cool, dry place.