Preheat oven to 350 F. Line a 13-inch sheet pan with parchment paper. Spread sesame seeds over the parchment. Roast sesame seeds in oven until lightly golden. This usually takes about 8 to 9 minutes.(Bear in mind that ovens can vary. You must watch the seeds carefully because they can go from golden to burned in a few seconds.)Remove seeds from oven and let cool for about 10 minutes.
Pour them into the bowl of a small food processor or blender container. Add the sesame oil and salt. Process or blend until the seeds have butterized and the mixture is smooth.
Use a spatula to scrape the tahini from the processor (or blender) into small storage container.Store in the fridge or a dark pantry, if you will use it frequently.
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Notes
Homemade tahini is not as smooth as most storebought versions. The texture reminds me of the peanut butter made from fresh peanuts in a natural foods grocery store.Two jars of sesame seeds found in the spice section of most grocery stores will equal about one cup of seeds. You can use 1 jar and cut the recipe in half. You can also buy sesame seeds online from Amazon: Anthony's Hulled Sesame Seeds (organic) come in a 2-lb package and Bob's Red Mill white, hulled sesame seeds are sold in a smaller 10-oz pouch. Both would make smooth tahini. Here's a link to purchase directly from the Bob's Red Mill site.