Asafoetida is an oleogum resin obtained from the living rhizomes and roots of Ferula assa-foetida, a branching perennial relative of fennel. In its most pure form (tears) it is a solid or semi-solid mass, with an intense, pungent, alliaceous odor, and bitter, acid taste. When used in minute quantities it enhances and blends the flavors of other spices, and imparts a delicate, onion-like flavor.