Is the tuna Provençale using an alternate definition for "slug" I've not heard before? I think the conventional definition is way too much wine to put in someth

Is the tuna Provençale using an alternate definition for "slug" I've not heard before? I think the conventional definition is way too much wine to put in something that's not meant to feed a small army, and a single bay leaf won't be nearly enough to balance that out.