I'd guess a bearnaise sauce if it's creamy in color. The egg yolks cause that. If it's a brownish red, it's usually a reduced wine pan sauce. Lots of butter in both so it has to be healthy. https://scontent-yyz1-1.xx.fbcdn.net/v/t1.18169-9/17795721_1264404103675809_7250935162105496370_n.jpg?_nc_cat=102&ccb=1-6&_nc_sid=8631f5&_nc_ohc=J7J-bI84clcAX_er6jC&_nc_ht=scontent-yyz1-1.xx&oh=00_AT8yU7ZPYnt82RU5qx3oxnF485GwUF_j7WdcWUOrDeHmVw&oe=62A050A4