Here's a recipe for homemade Tahini. At almost $7.00 for a 1-lb. jar, it's pretty pricey stuff. I haven't tried this myself, but after I finish the jar of Tahini that I just bought, I will. There's not much to it ---
INGREDIENTS: 5 cups sesame seeds
1-1/2 cups extra-virgin olive oil
DIRECTIONS: On a rimmed cookie sheet or in a 9x12 baking pan, spread the sesame seeds. Place in a 350F oven and toast lightly for 5-10 minutes, shaking seeds with spatula occasionally. Do not brown. Cool for 20 minutes. Put seeds and oil into food processor and blend to a smooth emulsion. Refrigerate.