Sentence:  For food, they [ancient Hawaiians] mixed the <WSD>arrowroot</WSD> with coconut cream or milk ("wai o ka nui"), or wrapped it in tī ("kī") leaves. Also they steamed the <WSD>arrowroot</WSD> in an "imu" to make the dessert "haupia". 
Meaning of the word marked with <WSD> tags:  A starchy substance obtained from the rhizomes of an arrowroot plant used as a thickener.