tea sandwich
US /ˈtiː ˌsænwɪdʒ/
UK /ˈtiː ˌsænwɪdʒ/

1.
a small, crustless sandwich, typically with light fillings, served as part of an afternoon tea or at other social gatherings
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We enjoyed delicate cucumber tea sandwiches at the garden party.
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She prepared a variety of fillings for the tea sandwiches.