pudding basin
US /ˈpʊd.ɪŋ ˌbeɪ.sən/
UK /ˈpʊd.ɪŋ ˌbeɪ.sən/

1.
a deep, round, heatproof bowl, typically with a rim, used for steaming or boiling puddings
:
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She greased the pudding basin thoroughly before adding the mixture.
•
The steamed Christmas pudding was cooked in a large pudding basin.