Tahini

"Sesame seeds are about 20% protein and contain some vitamins A and E and most of the B vitamins except B₁₂ and folic acid. Minerals, however are very abundant in sesame, as in most seeds. Sesame seeds are an excellent source of calcium for those avoiding cow's milk. "
(Hass, Staying Healthy With Nutrition; p330)

"Sesame butter sold in stores is whole sesame seeds milled into a butter, 'sesame Tahini' is made of sesame seeds with their hulls removed before milling, Tahini contains less fiber and is thus less laxative than sesame butter. Because oxalic acid is contained in the hull, Tahini is considered better for those in need of sesame's rich store of calcium"
(Pitchford; Healing with Whole Foods; p493)