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"): "pekinensis" or "Brassica rapa" Pekinensis Group) is a type of Chinese cabbage originating near the Beijing region of China, and is widely used in East Asian cuisine.
Relevant evidence: Yes