 It consists of a mix of oil and vinegar that is used as a marination that also preserves the food.Pescado en escabeche (escabeche fish) is a cold dish often made from Argentine hake that is buttered as in pescado a la marinera.After being separately fried, it is parboiled on a vinaigrette made of oil and vinegar that is added to sliced onions and carrots and whole garlic cloves and black pepper.