Chawanmushi is an egg custard dish found in Japan that uses the seeds of Ginkgo. A carton of free-range chicken eggs Ostrich egg Bird eggs are a common food source. ... Custard is a family of preparations based on milk and eggs, thickened with heat. ... Binomial name Ginkgo biloba L. The Ginkgo (Ginkgo biloba), frequently misspelled as Gingko, and sometimes known as the Maidenhair Tree, is a unique tree with no close living relatives. ...