Black tahini paste is just black sesame seeds ground down to a smooth paste. My favourite brand is Mayver's. Tahini is rich in minerals such as phosphorus, lecithin, magnesium, potassium and iron. It's an excellent source of calcium and zinc and also high in vitamin E and B vitamins. You can also make your own by lightly roasting black sesame seeds and blending in a blender or food processor until you reach a smooth paste .