chopped liver
US /ˌtʃɑpt ˈlɪvər/
UK /ˌtʃɑpt ˈlɪvər/

1.
a dish made from chicken or beef liver, hard-boiled eggs, and onions, chopped and seasoned, typically served as a spread or appetizer
:
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My grandmother always made the best chopped liver for holidays.
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We had rye bread with chopped liver as an appetizer.
1.
used to express that one feels unimportant or overlooked, often in a rhetorical question
:
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What am I, chopped liver? You didn't even say hello to me.
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Everyone got a promotion except me. Am I chopped liver?