How to wean baby fast?

A friend told me there's a kind of herb or leaf that tastes very bitter. She knows that i'm trying to wean Malcolm off and says that when rubbed onto skin, its taste will linger there for a few hours. She suggested that i use it to wean Malcolm off breastmilk. She cannot recall the name but it sounds like "Seruntut". I've asked a few friends and nobody's heard of it. She says the Malays use it a lot but i do not have many Malay friends. Can someone here help? I really do look like i've been taking diet pills as i'm looking so skinny after months almost three years of continuous nursing that kid.