Question: What material was used to carve out the shape of a Chinese cabbage head, an example being the Napa, a type of cabbage originating in the Beijing area of China and widely used in East Asian cuisine, which features a locust and katydid camouflaged in the leaves?
Sentence (from "Napa cabbage"): Since the 20th Century it is also a widespread crop in Europe, America and Australia.
Relevant evidence: No