Fenugreek is the spice which gives Madras curry powder its very characteristic, earthy, musky curry flavor and fragrance. The seeds are yellowish and look like tiny wheat kernels. Fenugreek leaves are also dried and used as a spice (they are commonly called kasuri methi) and are what make butter chicken unique. Fenugreek seeds are strongly fragrances and should be used with caution, just like cloves. They are also used in traditional medicine, and strangely enough, to make fake maple syrup.