pot·luck /ˈpɑtˈlʌk, ||ˌlʌk/
家常便飯
Pot·luck n. Whatever may chance to be in the pot, or may be provided for a meal.
A woman whose potluck was always to be relied on. --G. Eliot.
To take potluck, to take what food may chance to be provided.
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potluck
n : whatever happens to be available especially when offered to
an unexpected guest or when brought by guests and shared
by all; "having arrived unannounced we had to take
potluck"; "a potluck supper"