bain-marie

US /ˌbaɪn məˈriː/
UK /ˌbaɪn məˈriː/
"bain-marie" picture
1.

a container holding hot water into which a pan is placed for slow cooking, or to keep food warm.

:
The chef used a bain-marie to gently melt the chocolate.
Keep the sauce warm in the bain-marie until serving.