It is a sauce in which fish steak is cooked and to which are added capers, olives and lemon.
en.wikipedia.org This meal of steak and potatoes gets taken up a notch thanks to the addition of the rich anchovies and briny capers.
www.huffingtonpost.com One of his more famous capers involved a beanpole boy who showed soft hands in the field and a lashing stroke at the plate.
www.theglobeandmail.com In most cases, however, the "sugo" is a little salty (from the capers, olives, and anchovies) and quite fragrant (from the garlic).
en.wikipedia.org These sauces may themselves be named simply melted butter, drawn butter, or drawn butter sauce, and flavored with vinegar, salt, pepper, capers, nasturtium, and so on.
en.wikipedia.org