mat·jes herring 
(mätyĭs)
(mätyĭs)n.
Fillets of young herring that have not yet spawned, lightly cured with salt, vinegar, sugar, and spices.
[Partial translation of Dutch maatjesharing : maatjes (alteration of maeghdekins, genitive of maeghdekin, maiden, diminutive of maagd, maid; see maghu- in the Appendix of Indo-European roots) + haring, herring.]