Yes, tahini should be made from just one ingredient, sesame seeds. There is a misconception that tahini contains added oils because, similar to peanut butter, the naturally occurring oil of the sesame seeds tend to separate from the solids and rise to the top of the container. Tip: If you follow an oil-free diet and also try to reduce your fat intake, you may decide to pour off some of the oil at the top of the tahini. In this case, the tahini will be a much thicker paste. When using it in recipes like this one, you'll want to add a splash of water to the sauce for a thinner consistency.