The present invention provides a composition that imparts the meat flavor and seafood flavor produced by boiling meat and/or bone for an extended period of time at a low boil, in particular the immediate flavors thereof, and that can be easily produced and widely utilized. This composition contains (B) 1-penten-3-one, and at least one of (A) isovaleraldehyde and (C) hexanal wherein, when the weight parts of each component are taken as B, A, and C, respectively, and A + B + C/10 = 100, the following are satisfied: 0 ≤ A <; 80, 0 <; B <; 100, and 0 ≤ C/10 <; 80.本發明係一種組成物,其係賦予將肉類及骨頭經長時間微沸騰狀態燉煮所產生之食用肉類及海鮮風味,特別是該等之第一風味,可輕易地製造並廣泛利用,含有(B)1-戊烯-3-酮與(A)異戊醛以及/或(C)己醛之組成物,且提供分別將B、A及C設定為A+B+C/10=100時,各成分重量份係0≦A<80且0<B<100且0≦C/10<80之組成物。