Preheat oven to 350 degrees F (176 C), and arrange sesame seeds on a bare baking sheet. Bake for 10 minutes, or until slightly golden brown (being careful not to burn).
Remove from oven and let cool for 5 minutes. Then add to a food processor and blend until smooth, adding avocado or olive oil to encourage blending. The amount of oil you need will depend on the freshness of your sesame seeds and the power of your food processor.
Scoop into a jar or sealed container and store in the refrigerator up to 3-4 weeks.