Codornices en Escabeche is the Spanish name for a traditional Catalan dish often used for tapas. In Catalan it is called Guatlles amb Vinagreta. Instead of quails you can also use Rock Cornish hens (Poussins).
Escabeche is an age old technique used to preserve food. Fish, mussels, poultry or game are poached or fried in olive oil. Then they are marinated for at least 24 hours in garlic, herbs and vinegar and served at room temperature.