Esquire magazine has this version with 1st three ingredients going into an Old Fashioned glass, no stirring or shaking or ice: 1.5 oz Benedictine, 1.5 oz brandy, 1.5 oz Cointreau. Top off with Brut champagne.
Since I'd only B&B (DOM Benedictine & Brandy) and had used up the last of my Cointreau, I tried it with 3 oz B&B and just a little over an ounce of Grand Marnier, topped up with last night's leftover but pressure-stop'd Veuve Clicquot. This was a delightfully balanced drink; delicious.